Offend church after that (5)
I believe the answer is:
since
'after that' is the definition.
(thesaurus)
'offend church' is the wordplay.
'offend' becomes 'sin' (sin can mean to commit an offence).
'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" , "From that time one" , "Because; ago" .)