Church stirred basil in wine (7)
I believe the answer is:
chablis
'wine' is the definition.
(I know that Chablis is a type of white wine)
'church stirred basil in' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'stirred' indicates an anagram.
'in' means one lot of letters goes inside another.
'basil' is an anagram of 'ablis'.
'ch' inserted into 'ablis' is 'CHABLIS'.
(Other definitions for chablis that I've seen before include "French dry white wine" , "Dry white Burgundy" , "Burgundy town and white wine" , "Classic white wine from Burgundy" , "Dry Burgundy wine" .)