Dad's fizzy drink (3)
I believe the answer is:
pop
This clue is a double definition.
'dad's' is the first definition.
(synonyms)
'fizzy drink' is the second definition.
(pop is a type of fizzy drink)
(Other definitions for pop that I've seen before include "Burst - fizzy drink - modern music - US dad" , "Youthful music for dad?" , "Sound of a balloon bursting" , "'American Dad'!" , "Youthful music, dad(3)" .)