Single church with finest food
I believe the answer is:
ice cream
'food' is the definition.
(ice cream is a kind of food)
'single church with finest' is the wordplay.
'single' becomes 'i' (one).
'church' becomes 'ce' (abbreviation for Church of England).
'with' is a charade indicator (letters next to each other).
'finest' becomes 'cream' (the cream of something is its finest examples).
'i'+'ce'+'cream'='ICE-CREAM'
(Other definitions for ice cream that I've seen before include "Sweet frozen foodstuff" , "Gelato-like dessert" , "Party food" , "Frozen desert" , "Creamy frozen confection, best in summer" .)