It's a new variety of wine (4)
I believe the answer is:
asti
'variety of wine' is the definition.
'asti' can be an answer for 'wine' (Italian wine). I am unsure of the 'variety of' bit.
'it's a new' is the wordplay.
'new' indicates an anagram.
'its'+'a'='itsa'
'itsa' anagrammed gives 'ASTI'.
Can you help me to learn more?
(Other definitions for asti that I've seen before include "Fizzy wine" , "Capital of a north-west Italian province, known for its sparking wine" , "Italian white wine" , "Bubbly wine" , "Sparkling white wine" .)