Show French wine in English church (6)
I believe the answer is:
evince
'show' is the definition.
('evince' can be a synonym of 'show')
'french wine in english church' is the wordplay.
'french wine' becomes 'vin' (I've seen this before).
'in' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'church' becomes 'ce' (abbreviation for Church of England).
'e'+'ce'='ece'
'vin' put inside 'ece' is 'EVINCE'.
(Other definitions for evince that I've seen before include "Prove beyond doubt" , "Show or display, say feeling" , "Manifest, show" , "Show or display clearly" , "Indicate (something)" .)