Wine with a sparkle (4)
I believe the answer is:
asti
'wine with a sparkle' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for asti that I've seen before include "Source of fizz" , "town in Italy" , "Italian drunk" , "Sparkling white wine" , "It's a (anag) - wine" .)