It’s a strange sort of wine (4)
I believe the answer is:
asti
'wine' is the definition.
(I've seen this before)
'it's a strange sort' is the wordplay.
'strange sort' is an anagram indicator.
'its'+'a'='itsa'
'itsa' is an anagram of 'ASTI'.
'of' is the link.
(Other definitions for asti that I've seen before include "Italian product" , "Source of fizz" , "Italian town producing sparkling wine" , "Italian drunk" , "White wine named after a town in Piedmont" .)