Across:
1 Sin out of lustiness (‘sin’ out of ‘lustiness’ = lutess = TUSSLE) in free-for-all (TUSSLE),
4 One of those behind bar (ICE CHEST) cites (cites) trouble (= anagram indicator) (cites = IC- -EST) over community (European Community = -E C-) hospital (-H-) (ICE CHEST),
9 A (A-) drug smuggler (-MULE-) getting time (-T) (AMULET) for something a lucky jewel thief took? (AMULET),
10 This is likely to be the case (PROBABLE) for a (-A-) lawyer (-BL-) in study (probe = PROB-E) (PROBABLE),
12 Place (set) covering wild (= anagram indicator) (set = SE-T-) green (green = -RENGE-) summit in (summit ‘In’ = -I) (SERENGETI) national park (SERENGETI),
13 Caption missing from action-replay (‘caption’ missing from ‘action-replay = relay = LAYER) in film (LAYER),
14 A field worker is high on this (CHERRY PICKER) and 18 across for starters? (‘cherry picker’ for starters = CHERRY) Sort out (PICK-) in hospital! (-ER) (CHERRY PICKER),
18 27 across (‘cherry’ = CHERRY) and 19 down (‘tomato’ = TOMATO) (CHERRY TOMATO) consumed by salsa? (CHERRY TOMATO),
21 Switches (= reversal indicator) a (-A) precious stone (gem = -MEG-) for ring (O-) (OMEGA) – the last in a series (the last letter of Greek alphabet = OMEGA),
22 Salad (= anagram indicator), olios, nuts (olios nuts = SOLUTIONS) – presumably, those with problems of their own produced these (SOLUTIONS),
24 Crafty types (ARTISANS) free (= anagram indicator) tsarinas (tsarinas = ARTISANS),
25 Spoke (spoke/pole = BAR-) in South America (-RIO) (BARRIO) for the Spanish community (BARRIO),
26 Former chief (OVERLORD) designed (= anagram indicator) old Rover (old Rover = OVERLORD),
27 Shed tears (C-RY) over that Lady (-HER-) (CHERRY) in Red? (CHERRY).
Down:
1 Caught (= -C-) in fancy (= anagram indicator) tartans (tartans = TRANSA-T) (TRANSACT) in Carry on Business (carry on business = TRANSACT),
2 Old attendant (squire = SQUIR-E-) around queen (-R-) and sovereign (leader = -L-) (SQUIRREL) in type of fur (SQUIRREL),
3 Stay under the covers (LIE-IN) finishing (= position indicator) popular (IN) fiction (LIE-) (LIE-IN),
5 Joker (CARD-) influencing Agamemnon’s Clytemnestra leads (‘Influencing Agamemnons Clytemnestra’ leads = -IAC) revolution (CYCLE) (CARDIAC CYCLE) in four stages – it does the heart good presumably (CARDIAC CYCLE),
6 Sailor (able-bodied seaman = -AB-) in Visitor (caller = C-ALLER-) Centre of Andorra (centre of ‘andOrra’ = -O) (CABALLERO) is a lady’s man from Madrid (CABALLERO),
7 Shot from mother’s boy (‘shot’ from ‘mothers boy’ = EMBRYO) in the early stages of life (EMBRYO),
8 Holy Father doesn’t get half (‘Holy Father’ doesn’t get ‘half’ = hoyter = THEORY) the speculation (THEORY),
11 Don’t lose charge from cell (KEEP PRISONER) in lock-up (lock up = KEEP PRISONER),
15 Writing (from the 3Rs = R-) to doctors (= anagram indicator), healers (healers = EHE-RSAL) around America (-A-) (REHEARSAL) with time to practice in the theatre (REHEARSAL),
16 Party (LABOUR-) note (music note -E-) resistance (-R) (LABOURER) of one of the workers (LABOURER),
17 Does all the dirty work (DOGSBODY) for boxer’s (boxers = DOGS-) soul mate (-BODY and soul) (DOGSBODY),
19 Demonstration doesn’t include dinners (‘demonstration’ doesn’t include ‘dinners’ = motato = TOMATO) with fruit (TOMATO),
20 What you’d expect Polly to put on (Polly to put the KETTLE on) to restrict those in March (place where demonstrations are confined by police = KETTLE),
23 Train (TEACH) set removed from tea chest? (‘set’ removed from ‘tea chest’ = teach = TEACH).