Dad's drink? (3)
I believe the answer is:
pop
I believe this clue is a double definition.
'dad's' is the first definition.
('pop' can be a synonym of 'dad')
'drink?' is the second definition.
(pop is a kind of drink)
(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'!" .)