It’s a blend, this wine? (4)
I believe the answer is:
asti
'this wine?' is the definition.
(I've seen this before)
'it's a blend' is the wordplay.
'blend' indicates an anagram (I've seen 'blended' mean this).
'its'+'a'='itsa'
'itsa' anagrammed gives 'ASTI'.
(Other definitions for asti that I've seen before include "Fizzy wine" , "Sparkling white wine" , "Source of fizz" , "Sparkling wine named after an Italian Piedmont town" , "Italian drunk" .)