Across:
1 Plays a leading role at The Abbey (ABBESS) overseeing The Three Sisters, among others (ABBESS),
4 Top cobbler (top ‘cobbler’ = -C-) in footwear (S-ANDALS) (SCANDALS) has skeletons in the closet (SCANDALS),
9 Fail to get out of qualifiers (‘fail’ to get out of ‘qualifiers’ = quiers = SQUIRE) with an English gentleman (SQUIRE),
10 Treatment (MEDICINE) of old bankers (MEDICI-) gets a fair amount of (half of) headlines (half of ‘news’ = -NE) (MEDICINE),
12 Those old foreign high flyers (LUFTWAFFE) – the ones that left the neighbour’s place like a bomb hit it (LUFTWAFFE),
13 Draw (HEAVE) from clip (n) of Nirvana (‘heaven’ without ‘n’ = HEAVE),
14 Study (TRAIN) at home for the police (STATION) (TRAIN STATION) in Kent, for instance (Kent TRAIN STATION in Cork),
18 A word to the camera (CHEESE) sounds (= homophone indicator) more important (‘greater’ = ‘GRATER) (CHEESE GRATER) in the hands of chef making pizza topping (CHEESE GRATER),
21 Sorting out of waiting rooms (‘sorting’ out of ‘waiting rooms’ = waiom = MIAOW) is Tom’s call (MIAOW),
22 Clears out (EVACUATES) a cute vase (a cute vase = EVACUATES) damaged (= anagram indicator),
24 Drunk (= anagram indicator) very sour (very sour = SURVEYOR) type on site for good measure perhaps (SURVEYOR),
25 Greet coming out of race meeting (‘greet’ coming out of ‘race meeting’ = aceming = CINEMA) with pictures (CINEMA),
26 Negative aspect (DOWNSIDE) of Ulster team (DOWN-) on border (-SIDE) (DOWNSIDE),
27 Serves (serves = VERSES) stew (= anagram indicator) in Limerick (VERSE).
Down:
1 Leo’s tuba (Leo’s tuba = ABSOLUTE) played (= anagram indicator) in total without qualification (ABSOLUTE),
2 Beluga (Beluga = BLUE -AG) swimming (= anagram indicator) around Florida (FL-) (BLUE FLAG) – it’s a sign of a clean beach (BLUE FLAG),
3 Endless (end ‘less’ = S-) men on boat (-CREW) (SCREW) in wind (wind/twist = SCREW),
5 Had words (CHEWED THE FAT) with revolutionary (CHE-) getting married (-WED) over (= anagram indicator) a theft (a theft = THE FAT) (CHEWED THE FAT),
6 No sodas in boarding houses (no ‘sodas’ in ‘boarding houses’ = boringhue = NEIGHBOUR) for one of those next door (NEIGHBOUR),
7 Beastly type (ANIMAL) certain to get away from Latin-American (‘certain’ to get away from ‘Latin-American’ = lamina = ANIMAL),
8 Country (SWEDEN) root vegetable (SWEDE-) with point (compass point north = -N) (SWEDEN),
11 Reason for not reporting (OFF THE RECORD) old (O-) party (Fianna Fáil = -FF) in that place (there = THE RE-) with musical three-piece (“chord” = “cord” = -CORD) sounds similar (= homophone indicator) (OFF THE RECORD),
15 Not the sort of advice mobile sales staff want to hear (NO HAWKERS) from flighty type (HAWK-) consumed by Rocky (= anagram indicator) Rosen (Rosen = NO -ERS) (NO HAWKERS),
16 Stumbles (STUTTERS) out of small- (S-) -time (-T-) states (-UTTERS) (STUTTERS),
17 Turn on the waterworks (CRY-) for last (last = -STAL-) shift (= anagram indicator) producing endless (end ‘less’ = -S) (CRYSTALS) pieces of cut glass (CRYSTALS),
19 Occupied (AMUSED) by a (A-) thought (-MUSED) (AMUSED),
20 Public house (BAR-) on bank (-ROW) (BARROW) of river (River BARROW),
23 Join (UNITE) fool disappearing out of line (‘fool’ disappearing ‘out of line’ = utine = UNITE).