To purify church, is inclined to enter (7)
I believe the answer is:
cleanse
'to purify' is the definition.
(thesaurus)
'church is inclined to enter' is the wordplay.
'church' becomes 'ce' (abbreviation for Church of England).
'is inclined' becomes 'leans' ('lean' can be a synonym of 'be inclined'**).
'to enter' is an insertion indicator.
'ce' going around 'leans' is 'CLEANSE'.
(Other definitions for cleanse that I've seen before include "purify from sin" , "absolve from sin" , "Wash" , "give absolution" , "do some laundering?" .)