Italian sparkling wine (4)

I think it could be either:

Which length description are you looking for?:

asti

'italian sparkling wine' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for asti that I've seen before include "town in Italy" , "Sparkling drink" , "Sparkling white wine" , "Italian wine - (then change a letter for ...)" , "Capital of a north-west Italian province, known for its sparking wine" .)

I've seen this clue in The Guardian, The New York Times, The Sun and The Times.

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