Piedmont product (4)
I believe the answer is:
asti
'piedmont product' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for asti that I've seen before include "Italian town, famous for its wine" , "- spumante, It. wine" , "Piedmontese white wine" , "Fizzy wine" , "Italian drunk" .)