A drink, or nip (3)

I believe the answer is:

pop

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'a drink' is the definition.
(fizzy pop)

I cannot understand how the rest of the clue works.

(Other definitions for pop that I've seen before include "Youthful music for dad?" , "Youthful music, dad(3)" , "Explode; drink" , "Explosive sound; drink" , "US fizzy drink and type of music" .)

I've seen this clue in the Evening Standard.

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