No particular problem with this one, with the two longest words in the centre coming straightaway from the definitions.
Solving time: 12 mins
ACROSS
1 P SHAW The playwright George Bernard Shaw
2 E (C) LECTIC The last I solved. Definition is “broad” Electric = thrilling less r = right around c = Conservative
11 FILER Hidden reversal “In retrospect it’s a bit of”
21 UN (a foreign i.e. French for a) RAVEL (the composer)
23 O (B) S CURE Good misleading context. Definition is “cloak” very big = OS outsize (crossword staple) B = black. CURE with accent removed is the priest
25 TEENS Every second letter of “These ones” i.e. “regularly dropping out” and a nice &lit. to go with it.
26 S (US PIC) ION Sion = Zion
27 DISTRESS D (500 in Roman numerals) for M (1000) in Mistress
DOWN
5 CUP (Cambridge University Press) PA (Personal Assistant)
6 E (o)FFEND I A crossword word – because of the final I – title of respect (Turkish)
8 C (‘ARRY) ALL Cockney = take away the initial h
14 IN (Jules VERNE) “starts to” Scandalise Some
15 A L (EH = what) OUSE
16 A DIV(I)SOR
19 DI’S MISS
24 U (Superior = upper class) NI(x)ON