Fusses about drink (4)
I believe the answer is:
soda
'drink' is the definition.
(soda is a kind of drink)
'fusses about' is the wordplay.
'fusses' becomes 'ados' ('ado' can be a synonym of 'fuss').
'about' shows that the letters should be reversed in order.
'ados' backwards is 'SODA'.
(Other definitions for soda that I've seen before include "Drink containing carbonated water and sometimes flavouring" , "Alkaline substance used in cleaning, drinks etc" , "for use with whisky?" , "fizz" , "Fizzy water, goes well with whiskey" .)