Fall from grace in large section of church? (5)
I believe the answer is:
lapse
'fall from grace' is the definition.
(I've seen this in another clue)
'large section of church?' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'section of church?' becomes 'apse' (I've seen this in other clues).
'l'+'apse'='LAPSE'
'in' acts as a link.
(Other definitions for lapse that I've seen before include "Error; oversight" , "Slip-up" , "Fault" , "Become void, expire" , "Run out" .)