Across:
1 Proclaim performance synonymous with Bad Manners (SHOW NO RESPECT) or ignore (SHOW NO RESPECT),
10 Inhospitable (HOSTILE) hotel is (hotel is = HOSTILE) unkempt (= anagram indicator) (HOSTILE),
11 Sounds like (= homophone indicator) opening on 34 across (‘true rib’ = ‘true’ = ‘THROUGH’) is from one side to the other (THROUGH),
12 Don (WEAR) went to the bar for rounds (‘went to the bar’ for rounds = WEAR),
13 Rig comes off ring road (‘rig’ comes off ‘ring road’ = nroad = ADORN) in Trim (ADORN),
15 Make an appearance (SHOW) for all sides today (SHOW on four sides of today’s grid).
17 Naturally occurring material (ORE) found in rainforests (found in ‘rainforests’ = ORE),
19 Digs in the ribs (NUDGES) with elbows (NUDGES),
21 Take out local (‘take out’ locally = MURDER) to knock back (= reversal indicator) type of wine (red = -DER) and spirit (rum = MUR-) (MURDER),
22 Isn’t authorised to be in The House (BURGLAR) serving up (= reversal indicator) food (grub = BURG-) from city in America (Los Angeles = -LA-) – right? (-R) (BURGLAR)
23 Calm down (SUBDUE), there’s a boat (SUB-) on the way (-DUE) (SUBDUE),
25 Turns up (= reversal indicator) on The Hill (tor = -ROT) for the music (rap music = (PAR -) (PARROT) and is likely to repeat everything you say (PARROT),
27 Ore removed from rotten (‘ore’ removed from ‘rotten’ = ttn = TNT) explosives (TNT),
29 Nice road (Nice/French ‘road’ = ‘rue’) goes around (= reversal indicator) (rue = EUR-) old (O-) (EURO) capital (capital/money = EURO),
30 Musical pieces (SHOWS) by 15 across (‘show’ = SHOW-) and One Direction (south = -S) (SHOWS),
31 Co-star dropped by Sportscast (‘co-star’ dropped by ‘sportscast’ = psst = PSST) is the sort of attention grabber that not everyone will catch (PSST),
34 Part of the cage attachment (TRUE RIB attached to breastbone) is absolutely right (TRUE) on small boat (RIB) (TRUE RIB),
35 Got in (ENTERED) with key (ENTER- key on keyboard) taking direction (east = -E-) from department (-D) (ENTERED),
36 Make known (SHOW) individual (ONE -) has a number of parking options for car (-S PACES) (SHOW ONE’S PACES) and be quick about it (SHOW ONE’S PACES).
Down:
2 Group (-BAND) behind (= positional indicator) most (h) of The Sound of Silence (‘hush’ without ‘h’ = HUS-) (HUSBAND)? That’s one of a duo! (HUSBAND),
3 Stand by (WAIT) waste disposal unit casing (‘waste disposal unit’ casing = WAIT),
4 Amplify the fact (OVERDO) old (O-) composer (Verdi) isn’t finished (i) (‘Verdi’ without ‘i’ = -VERD-) with orchestra leader (‘orchestra’ leader = -O) (OVERDO),
5 Complete (ENTIRE) building (= anagram indicator) in tree (in tree = ENTIRE),
6 By the way (road), leave it (PARK it) in power (P-) boat (-ARK) (PARK),
7 Pressed (CRUSHED) record (compact disc = C-D) about Dublin town (-RUSH-) from last take (from last ‘take’ = -E-) (CRUSHED),
8 Threaten (SHOW ONE’S TEETH) to do this for bridge-builder? (SHOW ONE’S TEETH for bridge-builder/dentist),
9 Guide (guide/lead = SHOW) takes credit (GRATITUDE) (SHOW GRATITUDE) for the exhibition? Thanks a lot! (SHOW GRATITUDE),
14 Herb (OREGANO) Ring (O-) from Orange (orange = -REGANO) Order (= anagram indicator) (OREGANO),
16 Offer a counter argument (REBUT) to upset (= reversal indicator) Spud (spud = tuber = REBUT),
18 Isn’t out of trial runs (‘isnt’ out of ‘trial runs’ = ralru = RURAL) in the countryside (RURAL),
20 Reports coming out of superstore (‘reports’ coming out of ‘superstore’ = sue = SUE) – look for damages (SUE),
21 Politician (M-P) taking in America (-A) (MAP) would be lost without this (MAP),
24 A fair amount of (half of) the novel (book) (half of ‘book’ = BO-) is rustic? (-ROUGH), (BOROUGH) For example, Brooklyn! (New York’s Brooklyn is a BOROUGH),
26 Is about (RE-) to work (-SERVE) (RESERVE) for qualification (qualification/proviso = RESERVE),
27 Old European (THEBAN) prohibition restricting the players switching codes in past (‘the ban’ prohibited switching codes/sports = THE BAN),
28 Posts: (TWEETS) “I ran away from wine taster” (‘I ran’ away from ‘wine taster’ = wetste = TWEETS),
32 Obtain from rowing boat (‘obtain’ from ‘rowing boat’ = rwgo = GROW) to shoot up (GROW),
33 No grain in Argentina (no ‘grain’ in ‘Argentina’ = enta = ETNA) or Sicilian hot spot (ETNA).