Quote it in church (4)
I believe the answer is:
cite
'quote' is the definition.
('cite' can be a synonym of 'quote')
'it in church' is the wordplay.
'in' is an insertion indicator.
'church' becomes 'ce' (abbreviation for Church of England).
'it' going into 'ce' is 'CITE'.
(Other definitions for cite that I've seen before include "Give as an example" , "Quote as an example or in support" , "Adduce as proof" , "Quote (eg, a book)" , "for instance" .)