Never again paid for by church (4)
I believe the answer is:
once
'never again' is the definition.
(once can mean one time only)
'paid for by church' is the wordplay.
'paid for by' becomes 'on' (I've seen this in other clues).
'church' becomes 'CE' (abbreviation for Church of England).
'on'+'ce'='ONCE'
(Other definitions for once that I've seen before include "Quick examination" , "In days gone by" , "At some former time" , "in bygone days" , "One-time - one time" .)