Trouble with son about drink (4)
I believe the answer is:
'drink' is the definition.
(I know that soda is a type of non-alcoholic beverage)
'trouble with son about' is the wordplay.
'trouble' becomes 'ado' (both can mean bother or commotion).
'with' says to put letters next to each other.
'son' becomes 's' (genealogical abbreviation for son).
'about' is a reversal indicator.
'ados' backwards is 'SODA'.
(Other definitions for soda that I've seen before include "kind of water" , "Drink containing carbonated water and sometimes flavouring" , "Splash served with some spirits" , "Fizzy water, goes well with whiskey" , "for use with whisky?" .)