It's a new tipple (4)

I believe the answer is:

asti

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'tipple' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'it's a new' is the wordplay.
'new' is an anagram indicator.
'its'+'a'='itsa'
'itsa' is an anagram of 'ASTI'.

Can you help me to learn more?

(Other definitions for asti that I've seen before include "Piedmont wine city, SE of Turin" , "- spumante, It. wine" , "Source of fizz" , "Sparkling wine named after an Italian Piedmont town" , "Italian drunk" .)

I've seen this clue in The Mirror.

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