Cavity appearing shortly after fizzy cola drink (7)
I believe the answer is:
alcohol
'drink' is the definition.
(I know that alcohol is a type of drink)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for alcohol that I've seen before include "wine, say" , "lager, perhaps" , "To a position aboard" , "Intoxicant fluid" , "The intoxicant in drink" .)