Across:
1 Rewritten (= anagram indicator) blog (blog = GLOB-) for a (-A-) novice (learner = -L) (GLOBAL) with general view (GLOBAL),
4 Fellow (ACADEMIC) produced a (A-) computer-aided design (computer-aided design = -CAD-) to train (= anagram indicator) mice (mice = -EMIC) (ACADEMIC),
9 Vicar from Deliverance (‘vicar’ from ‘deliverance’ = delene = NEEDLE) and The Sting? (NEEDLE),
10 Tap (KNOCK-) is not in the house (-OUT) (KNOCKOUT) or deck? (KNOCKOUT),
12 Cuban riot (Cuban riot = INCUBATOR) doctor (= anagram indicator) is left holding the baby perhaps in the early stages (INCUBATOR),
13 The New Yorker’s (The New Yorkers = YANKS) retiring (= reversal indicator) broadcaster (Sky = Y-KS) absorbs article (-AN-) (YANKS),
14 Catch wind of (HEAR-) initial trouble (initial ‘trouble’ = -T) and lack of success (FAILURE) (HEART FAILURE) – it could be the death of you (HEART FAILURE),
18 For those learning their lessons, Grant’s (SCHOLARSHIPS) similar to one of those in 4 across (SCHOLAR- similar to ‘academic’) going overseas (-SHIPS) (SCHOLARSHIPS),
21 No tin in salt mine (no ‘tin’ in ‘salt mine’ = salme = MEALS) for the consumers (MEALS),
22 One of those in the park (one of those in The Park = PRESIDENT) spinning (= anagram indicator) spider net (spider net = PRESIDENT),
24 Cockney (LONDONER) is hardly a people-person (LON-ER) protecting gangster (-DON-) (LONDONER),
25 Runs daily (EDITOR) and gets to ride to (ride to = EDITOR) work (= anagram indicator),
26 Hated (DETESTED) analysis (-TEST-) in the middle of act (act = DE-ED) (DETESTED),
27 Some characters layoff a bricklayer (some characters “layoff a bricklayer” = FABRIC) in construction, in the building sense (FABRIC).
Down:
1 Piece (GUN-) on The Clash (-FIGHT) (GUNFIGHT) leads to bitter exchange in the west (GUNFIGHT),
2 Wrapped up (OVER-) by firm (-CO-) for a (-A-) time (-T) (OVERCOAT) with a colourful finish (OVERCOAT paint),
3 Some mislead librarian (some ‘mislead librarian’ = AD LIB) off the cuff (AD LIB),
5 One of those manipulating the system (CONTROL PANEL) to switch (CONTROL switch) the jury (PANEL) (CONTROL PANEL),
6 In court (DOCK-) and in prisons (-YARDS) (DOCKYARDS) or whatever floats your boat? (DOCKYARDS),
7 Speaking of the herd (MOOING), satellite (MOO-N-) picks up current (electric current V = I/R = -I-) legend (end of leg = -G) (MOOING),
8 The cleverest of them all (CUTEST) removes Spring from press cutting (‘Spring’ missing from ‘press cutting’ = escutt = CUTEST),
11 Above all (STRATOSPHERE), street ((ST-) artist (-RA-) is going to (-TO-) ball (-SPHERE) (STRATOSPHERE),
15 Friar’s (Friar Tuck’s = TUCK S-) beer ingredients (-HOPS) (TUCK SHOPS) from Glenstal Abbey’s stores, for instance (TUCK SHOPS),
16 Angry (= anagram indicator) creditor (creditor = DIRECTOR) makes a scene (DIRECTOR),
17 Recites (recites = ES-TERIC) novel (= anagram indicator) about old (-O-) (ESOTERIC) secret (ESOTERIC),
19 Looked happy (SMILED) in school (S-) race (-MILE- race) finishing at speed (finishing at ‘speed’ = -D) (SMILED),
20 Digs up (= reversal indicator) most of the lawn (most of the ‘lawn’ = law = WAL-) for crazy (-NUT) (WALNUT) source of oil (WALNUT),
23 Country (INDIA) covered up trade in diamonds (‘trade in diamonds’ = INDIA).