Vino region (4)
I believe the answer is:
asti
'vino region' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for asti that I've seen before include "Italian town, famous for its wine" , "Italian 'sparkler'" , "Sparkling white wine" , "Sparkling drink" , "Italian town producing sparkling wine" .)