First person in church opposed to wine (7)
I believe the answer is:
chianti
'to wine' is the definition.
(Chianti is an example)
'first person in church opposed' is the wordplay.
'first person' becomes 'I' (first-person pronoun).
'in' means one lot of letters goes inside another.
'church' becomes 'ch' (abbreviation on maps etc).
'opposed' becomes 'anti' (similar in meaning).
'ch'+'anti'='chanti'
'i' inserted inside 'chanti' is 'CHIANTI'.
(Other definitions for chianti that I've seen before include "Dry red Italian wine" , "Italian wine - mountain range" , "European wine" , "I can hit for popular Italian wine" , "Wine produced in Tuscany" .)