It's a revolutionary wine (4)

I believe the answer is:

asti

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'wine' is the definition.
(Italian wine)

I can't explain the remainder of the clue.

(Other definitions for asti that I've seen before include "- spumante, It. wine" , "White wine named after a town in Piedmont" , "It's a (anag) - wine" , "Capital of a north-west Italian province, known for its sparking wine" , "Sparkling white wine" .)

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