Is inclined to enter church to get pure (7)
I believe the answer is:
cleanse
'get pure' is the definition.
'is inclined to enter church' is the wordplay.
'is inclined' becomes 'leans' ('lean' can be a synonym of 'be inclined').
'to enter' is an insertion indicator.
'church' becomes 'CE' (abbreviation for Church of England).
'leans' going within 'ce' is 'CLEANSE'.
'to' acts as a link.
(Other definitions for cleanse that I've seen before include "Make spotless" , "clear of muck" , "do some laundering?" , "purify from sin" , "give absolution" .)