Soda (3)
(Other definitions for sal that I've seen before include "Sarah (dim.)" , "girl?" , "- - volatile" .)
'soda' is the definition.
(synonyms)
This is all the clue.
(Other definitions for pop that I've seen before include "Music with mass appeal" , "Sound of a balloon bursting" , "Old jingle - . . . goes the weasel" , "Youthful music for dad?" , "Palindrome of music for the young" .)