What may cover grave at heart of chapel? (7)
I believe the answer is:
epitaph
'what may cover grave at heart of chapel?' is the definition.
I can't judge whether this definition defines the answer.
'what may cover grave at heart of chapel?' is the wordplay.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'may cover' indicates putting letters inside.
'grave' becomes 'pit'.
'at heart of' says to take the centre (I've seen 'at heart' mean this).
The central letters of 'chapel' are 'ap'.
'pit'+'ap'='pitap'
'eh' placed around 'pitap' is 'EPITAPH'.
(Other definitions for epitaph that I've seen before include "Words carved on a gravestone" , "Tombstone inscription" , "last words" , "RIP, for example" , "Tomb inscription" .)