Across:
1 Father (REV-) is (-IS-) from Spain? (-E) (REVISE) Correct! (correct/change = REVISE),
4 Mass producers (CHURCHES) in awful (= anagram indicator) crush (crush = CHUR-S) around revolutionary (-CHE-) (CHURCHES),
9 Relative (son = S- ON) welcomes finish (-END) (SEND ON) by forward (SEND ON)
10 A crafty type (TRIMARAN) cut off (TRIM-) from island off Galway (-ARAN) (TRIMARAN),
12 Is this the position prince takes when disowned by royal family (OUT OF LINE) for being improper? (OUT OF LINE),
13 Sample of brownie certified (sample of ‘browNIE CErtified’ = NIECE) by family member (NIECE),
14 Space on Hill 16 (STANDING ROOM) for substitute (stand in = STANDIN-) looking after 7 down (‘groom’ looking after ‘horses’ = -G ROOM) (STANDING ROOM),
18 Authoritarian (TOTALITARIAN) unit (-I-) involved in unstable (= anagram indicator) Atlanta riot (Atlanta riot = TOTAL-TARIAN) (TOTALITARIAN),
21 Speak off the cuff (AD-LIB) with tips for disguising loans (tips for ‘Disguising Loans’ = -D-L-) in The Bank (Allied Irish Banks = AIB = A- -IB) (AD-LIB),
22 The beastly one (GREAT DANE) in Hamlet? (GREAT DANE),
24 Man in the street (CIVILIAN) polite (CIVIL-) to leaders? I’m afraid not! (leaders/first letters of ‘Im Afraid Not’ = -IAN) (CIVILIAN),
25 Hired (RENTED) bar from bartender (‘bar’ from ‘bartender’ = tender = RENTED),
26 Under pressure (STRESSED) to reorder (= anagram indicator) dresses (dresses = S-RESSED) over time (-T-) (STRESSED),
27 Was afraid (FEARED) bloodsucker (flea) lost out (‘l’ out) (‘flea’ without ‘l’ = FEA-) to cardinal? (cardinal -RED) (FEARED).
Down:
1 Press one (press one) criminal (= anagram indicator) (press one = RESPONSE) to answer (RESPONSE),
2 One of those in Rialto (VENETIAN) ain’t even (ain’t even) working (= anagram indicator) (ain’t even = VENETIAN),
3 A parody (SPOOF) of burlesque? (SPOOF),
5 Arabian (HORSE) coach (TRAINER) (HORSE TRAINER) is responsible for getting the best out of 7 down (HORSE TRAINER is responsible for getting the best out of ‘horses’),
6 Caesar, for one (ROMAN), got (got) served up (= reversal indicator) (got = TOG-) a (-A) (ROMAN TOGA) type of Italian wrap (ROMAN TOGA),
7 Foremost hybrid (foremost ‘Hybrid’ = H-) roses (roses = -ORSES) developed (= anagram indicator) (HORSES) by those in Derby (HORSES),
8 One of those doing the numbers (SINGER) for consigliere dismissing e coli (‘consigliere’ dismissing ‘e coli’ = nsigre = SINGER),
11 Handy way of replying (SIGN LANGUAGE) that allows some people to be heard? (SIGN LANGUAGE),
15 They get pressed going into The Houses (DOORBELLS) to upset (= reverse indicator) cross (cross/crucifix = rood = DOOR-) types employed in hotel receptions (reception -BELLS) (DOORBELLS),
16 Set up (= reversal indicator) Sidney (Sid = DIS-) with Daisy’s relative (-ASTER) (DISASTER) Calamity (DISASTER),
17 The latest trend (fashionable = IN-) – brief (r) romantic (‘tender’ without ‘r’ = -TENDE-) date (-D) (INTENDED) with fiancée (INTENDED),
19 Accountant (CA-) heads for Uruguay, Columbia (heads for ‘Uruguay Columbia’ = -UC-) and America (-US) (CAUCUS) from political meeting (CAUCUS),
20 Small (S-) piece of meat (-LIVER) (SLIVER) with one of the chips (SLIVER),
23 What’s the subject (THEME) of groan from hatemonger? (‘groan’ from ‘hatemonger’ = hteme = THEME).