Across:
1 Introducing Princess (introducing ‘Princess’ = -P-) Beatrice (-BEA-) in Utah (UT = U-T) (UPBEAT) in high spirits (UPBEAT),
4 This will give you a start (IGNITION) or get you fired? (IGNITION),
9 Serves up (= reversal indicator) fresh (raw = WAR-) starters of salad and wings (starters of ‘Salad And Wings’ = -SAW) (WARSAW) in European capital (WARSAW),
10 Spread out (DIFFUSED) to clear the air (defuse) broadcasting (= homophone indicator) (‘defuse’ = ‘diffuse’ = DIFFUSE -) on top of Derryclare (on top of ‘Derryclare’ = -D) (DIFFUSED),
12 Look up to one of those (ROLE MODEL) with a job in the abbey (ROLE), for example (MODEL) (ROLE MODEL),
13 Kind of manual (USERS manual) for draft-dodging fraudsters (‘draft’ dodging ‘ fraudsters’ = users = USERS),
14 Shrewd bargaining (HORSE-TRADING) by most (s) of those in 27 across (horses) (‘horses’ without ‘s’ = HORSE-) involved in dealing (TRADING) (HORSE-TRADING),
18 Is aiming to get the best out of Russian Don (Russian Don = breed of horse) (HORSE-TRAINER) by starting 14 across (starting ‘horse-trading’ = HORSE-) for one looking after competitive type in Ring (one looking after boxer = TRAINER) (HORSE-TRAINER),
21 Stop living (die = -DIE-) in Australia (AU= A-U) (ADIEU) or I’m off! (ADIEU),
22 Put together (BRACKETED) by director (-D) behind (= position indicator) criminal activity (racket = -RACKET-) in Belgium (Belgium/ BE = B-E-) (BRACKETED),
24 Passage (CORRIDOR) in tape (cord = COR-D-) covering border (rim) is cut (m) (‘rim’ without ‘m’ = -RI-) along with old (-O-) writing (from the 3Rs = -R) (CORRIDOR),
25 On reflection (= reversal indicator), is able (can = -NAC) to go (go = -OG-) to clubs (C-) (COGNAC) drunk in France (COGNAC),
26 Identify the problem (DIAGNOSE) with English (-E) ballad (song = -GNOS-) getting to support (aid = DIA-) all the characters in Revolution (= reverse all indicator) (DIAGNOSE),
27 Nags (HORSES) outlets? (hoses = HO-SES) About right! (right = -R-) (HORSES).
Down:
1 Why run to (why run to) change (= anagram indicator) (why run to = UNWORTHY) what’s not good? (UNWORTHY),
2 Rob’s in the house (robs in the house/ BURGLARS) with listening device (bug = BU-G-) taking in record’s opening (‘Records’ opening = -R-) intros to Like a Rolling Stone (intros to ‘Like A Rolling Stone’ = -LARS) (BURGLARS),
3 A wake-up call (ALARM) for team dumped by Alma Mater (‘team’ dumped by ‘Alma Mater’ = almar = ALARM),
5 Intensely questioned local (GRILLED) for support in the garden (stake) hearing (= homophone indicator) (‘stake’ = ‘steak’ = STEAK) (GRILLED STEAK) one is cooking on the barbecue (GRILLED STEAK),
6 Cool (IN-), eloquent (fluent), short (t) (‘fluent’ without ‘t’ = -FLUEN-) letters (A to Z) brought up (= reverse indicator) (A to Z = -ZA) (INFLUENZA) as likely to go viral in unhealthy way (INFLUENZA),
7 Broadcasts (releases = ISSUES) to lots of children (ISSUES),
8 A desire to expose (NUDISM) acts from music stand (‘acts’ from ‘music stand’ = musind = NUDISM),
11 What man of letters (postman) might be looking for (ADDRESS) from reserve’s (reserves/books = BOOKS) (ADDRESS BOOKS) lists of contacts (ADDRESS BOOKS),
15 Constantly changing (EVOLUTION) Rising (revolution) lacks a leader (r) (‘revolution’ without ‘r’ = EVOLUTION),
16 Isn’t (isn’t = IN-TS) angry (= anagram indicator) over Stanley (-STAN-) (INSTANTS) getting seconds? (seconds/moments = INSTANTS),
17 Collected (= anagram indicator) dirt spec (dirt spec = PREDICTS) – it’s what Cassandra does (PREDICTS),
19 Managed (RAN-) the police department (Criminal Investigation Department = -CID) (RANCID) when one is off for a long time? (RANCID),
20 Redevelopment (= anagram indicator) is rare (is rare = SIERRA) in the mountain range (SIERRA),
23 Boss (= anagram indicator) took (took = K-OTO) over yard (yard = -Y-) (KYOTO) in old Asian capital (old Japanese capital = KYOTO).