Sparkling wine which must be made entirely from Moscato Bianco grapes (4)

I believe the answer is:

asti

(Other definitions for asti that I've seen before include "Sparkling white wine" , "Source of fizz" , "- spumante, It. wine" , "Sparkling drink" , "Fizzy wine" .)

I've seen this clue in The Sunday Times and The Times.

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