Across
Greek character pinned by relatively insignificant monster … (8)
... that character taken around fish (6)
11a
It is a question about the old man's health (4,4,6)
See 10
Expert leaving to enter wine store (6)
Maybe helmet's protecting Irish copper in top operations (8)
This rock not completely malleable? I allegedly use sand! (7)
19d
Most unexpectedly opposing everything offered by bookmaker (7,3,4)
Books (hardback) in shopping centre store for a long time (8)
Article in comic is only a rumour (6)
Underground accommodation teacher has to put up with in Scotland (6,4)
Labour's material electorate finally discarded (4)
One who wrote about pilgrim with no heart retreating (6)
A rum and I'd be exceptionally cordial (8)
Down
Severe operatic prince in endless stir (8)
13d
Treatment favouring chums that sounds sexist? (4,3,3,4)
Gulf that vessel floats on (6)
What is to some extent raw, rough, till beaten into shape (7)
Agitation no end with affair that is oppressive (8)
24d
A hit tune, almost because somehow it connects to the listener (10,4)
Fish not deprived of oxygen in stretch of water (6)
See 2
Firm given top grade, smart and doing well with little effort (8)
Island noise interrupting end of wondrous song (8)
See 17
Obscure work — a strange hesitation to avoid it (6)
Islander certain to migrate, leaving island behind (6)
See 6
Type letters or click words in the clue