Church support overlooking holy man’s tweet (7)
I believe the answer is:
chirrup
'tweet' is the definition.
(I've seen this before)
'church support overlooking holy man's' is the wordplay.
I cannot really see how this works, but
'church' could be 'ch' (common abbreviation) and 'ch' is located in the answer.
'man' could be 'r' (abbreviation for rook, a chess piece or 'man') and 'r' is found within the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for chirrup that I've seen before include "Chirp" , "Make high-pitched sounds" , "Cheep" , "Trill" , "Tweet" .)