Adults only follow drone for alcohol (4)
I believe the answer is:
beer
'alcohol' is the definition.
(beer is a kind of alcohol)
'adults only follow drone' is the wordplay.
'adults only' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'follow' is a charade indicator (letters next to each other).
'drone' becomes 'bee'.
'r' put after 'bee' is 'BEER'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for beer that I've seen before include "Hop-flavoured drink" , "... this at pub?" , "The standard English drink" , "Drink with a head" , "Fermented alcoholic beverage" .)