Sparkling wine found in tasting (4)
I believe the answer is:
asti
'sparkling wine' is the definition.
(Asti is a type of sparkling wine)
'in tasting' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ASTI' is hidden in the letters of 'tasting'.
'found' acts as a link.
(Other definitions for asti that I've seen before include "Italian white wine" , "Piedmont wine city, SE of Turin" , "It's a (anag) - wine" , "Italian wine - (then change a letter for ...)" , "Source of fizz" .)