Offend against church after that (5)
I believe the answer is:
since
'after that' is the definition.
(thesaurus)
'offend against church' is the wordplay.
'offend' becomes 'sin' (sin can mean to commit an offence).
'against' is a charade indicator (letters next to each other).
'church' becomes 'CE' (abbreviation for Church of England).
'sin'+'ce'='SINCE'
(Other definitions for since that I've seen before include "Seeing that" , "in the past" , "Because; ago" , "From that time one" .)