Beastie imports Piedmont booze (4)

I believe the answer is:

asti

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'piedmont booze' is the definition.
The definition suggests a singular noun which matches the answer.

'beastie imports' is the wordplay.
'ASTI' is hidden in amongst the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for asti that I've seen before include "Sparkling white wine" , "Fizzy wine" , "Source of fizz" , "Piedmont wine city, SE of Turin" , "Italian town producing sparkling wine" .)

I've seen this clue in The Sun.

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