Former religious figure not entirely accepting church swap (8)
I believe the answer is:
exchange
'swap' is the definition.
(I've seen this before)
'former religious figure' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'religious figure' becomes 'change' (I can't explain this - if you can you should believe this answer much more).
'ex'+'change'='EXCHANGE'
'not entirely accepting church' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for exchange that I've seen before include "Altercation" , "'Swap, trade (8)'" , "place of business" , "Brief argument" , "Substitute" .)