Across:
1 Fast (QUICK) to get slim (THIN-) folks? (-KIN-) That’s grand (-G) (QUICK THINKING) only for those whose mind hasn’t slowed down! (QUICK THINKING),
10 Relates to single (UNITARY) train (train) running (= anagram indicator) (train = -NITAR-) between outskirts of underground railway (outskirts of ‘Underground railwaY’ = U-Y) (UNITARY),
11 University (-U-) in terrible (= anagram indicator) peril (peril = P-RLIE-) from upstart (‘Up’ start = -U) (PURLIEU) in the surrounding area (PURLIEU),
12 It’s trendy (COOL) all around the Costa del Sol (all around the ‘COsta del sOL’ = COOL),
13 On the ball (QUICK) on all sides today (QUICK on all sides of today’s grid),
15 Catholic dismisses a lot (‘Catholic’ dismisses ‘a lot’ = chic = CHIC) that’s in Vogue (that’s in vogue/fashionable = CHIC),
17 Child (TOT) of patriots missing Paris (‘patriots’ missing ‘Paris’ = tot = TOT),
19 Has done more than most to change what’s on television (REMOTE) in the sticks (REMOTE),
21 Not the first (‘Not’ the first = -N-) in party (DUP) set-up (= reverse indicator) (DUP = PU-D-) to get open invitation (open ‘Invitation’ = -I-) to join tenor (-T) (PUNDIT) and one of the Talking Heads (PUNDIT),
22 Writer (-ED-) is one (-I-) taken in by composition (opus = O-PUS) (OEDIPUS) produced by a complex character? (OEDIPUS complex),
23 Custodian (CAPTOR) of Cork (cork = CAP-) hill (-TOR) (CAPTOR),
25 Takes cues from sheet music (takes ‘cues’ from ‘sheet music’ = hemsi = THEISM) and belief in the creator (THEISM),
27 Alone, letting without letting on (‘alone letting’ without ‘letting on’ = ale = LEA) in the meadow (LEA),
29 Part of the recipe for Wiener Schnitzel (VEAL) – leaving out gin? (‘leaving’ out/without ‘gin’ = VEAL),
30 The overheads (COSTS) of setting up (= reverse indicator) characters in populist society (characters in populiST SOCiety = stsoc = COSTS),
31 Some unforced error? (some ‘unforCED Error’ = CEDE) Give up! (CEDE),
34 Writing (from the 3Rs = -R-) from Pole (north = =N-) in Liege (Liege) novel? (= anagram indicator) (Liege = -EELI-G) (REELING) That’s staggering! (REELING),
35 No minors in documentaries (no ‘minors’ in ‘documentaries’ = dcuetae = EDUCATE) with tutor (EDUCATE),
36 Clever (QUICK) getting answer (A-) from South Africa (SA = -S A) on Zoom (FLASH) (QUICK AS A FLASH) before you can say Jack Robinson (QUICK AS A FLASH).
Down:
2 Jockey’s silks, for example (UNIFORM), in stable (stable/even = UNIFORM),
3 Knock back (= reversal indicator) strong liquor (marc = CRAM) in study at the last minute (CRAM),
4 Local hype (hype/push = tout = T-OUT) over fish with innards removed (a) (‘ray’ without ‘a’ = -RY) (TRY OUT) put to the test (TRY OUT),
5 One (I-) foreign politician (-MP-) getting to make a scene (-ACT) (IMPACT) or that’s the impression (IMPACT),
6 A Turkish native (KURD) heavily on the beer (drunk) fell over (= reverse indicator), losing direction (North = ‘n’) (“drunk” without ‘n’ = druk = KURD),
7 Had a word with fellow Arabians (Arabian horses NEIGHED) as no (nay) State (= homophone indicator) (‘nay’ = ‘neigh’ = NEIGH-) Emergency demoralised leaders (‘Emergency Demoralised’ leaders = -ED) (NEIGHED),
8 High-speed (high-speed = QUICK) rally (RECOVERY) (QUICK RECOVERY) – for those leaving the hospital in a hurry (QUICK RECOVERY),
9 Swift (QUICK-), occasionally works in office (-TEMP-), in hospital (-ER-) and in the press (-ED) (QUICK-TEMPERED), like a bear with a sore head (QUICK-TEMPERED),
14 Without organisation (UN) from the start, advocates for labour force (‘unionises’ without ‘un’ = IONISES) charges (IONISES),
16 Type of seat (STOOL) for a number of gents (loos) retiring (= reverse indicator) (loos = S-OOL) around end of the night (end of the ‘nighT’ = -T-) (STOOL),
18 Forward (PUSHY) is hardly retiring? (PUSHY),
20 No head (b) on stout (beer) (no head on ‘beer’ = E’ER) – that’s always for the poet? (‘always’ in poetic language = E’ER),
21 Persecuted without decrees (‘persecuted’ without ‘decrees’ = put = PUT) in place (PUT),
24 Serving (PLATE-) a (-A-) university (-U) (PLATEAU) that’s plainly on the rise (PLATEAU),
26 Really cool places (ICE CAPS) in one (I-) top-class (top ‘Class’ = -C-) revolutionary (= reverse indicator) space (space = -E CAPS) (ICE CAPS),
27 Gallery in the house (LOGGIA) locked up (= reverse indicator) by Padraig Goldsmith (locked up by ‘padrAIG GOLdsmith’ = aiggol = LOGGIA),
28 A wise woman (ATHENA) back in the day (-THEN-) in teetotal organisation (AA = A-A) (ATHENA),
32 An element (ZINC) stealing tie from citizen (stealing ‘tie’ from ‘citizen’ = cizn = ZINC),
33 Had enough (FULL) of awful loathsome characters inside (‘awFUL Loathsome’ characters inside = FULL).