Drinks selling in small bottles (4)
I believe the answer is:
gins
'drinks' is the definition.
(gin is a kind of drink)
'selling in small bottles' is the wordplay.
'bottles' says the answer is hidden in the clue (bottling is a kind of containing).
'GINS' is hidden in the letters of 'selling in small'.
(Other definitions for gins that I've seen before include "Drinks; traps" , "Alcoholic drinks" , "Sings badly for drinks" .)