Dad's drink? (3)

I believe the answer is:

pop

I believe this is a double definition.

'dad's' is the first definition.
(synonyms)

'drink?' is the second definition.
(fizzy pop)

(Other definitions for pop that I've seen before include "Youthful music for dad?" , "Sound of a balloon bursting" , "Music with mass appeal" , "Thus goes the musical weasel" , "'American Dad'!" .)

I've seen this clue in the Evening Standard.

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