A sparkling white wine from Italy (4)

I believe the answer is:

asti

(Other definitions for asti that I've seen before include "- spumante, It. wine" , "Sparkling white wine" , "Fizzy wine" , "Capital of a north-west Italian province, known for its sparking wine" , "Piedmontese white wine" .)

I've seen this clue in The Guardian.

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