It's a wine (4)

I believe the answer is:

asti

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'wine' is the definition.
(Italian wine)

'it's a' is the wordplay.
'it's a' can be anagrammed to 'ASTI'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for asti that I've seen before include "Italian wine - (then change a letter for ...)" , "Capital of a north-west Italian province, known for its sparking wine" , "Sparkling drink" , "Piedmont wine city, SE of Turin" , "18" .)

I've seen this clue in The Irish Independent.

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