Drink, child (3)
I believe the answer is:
tot
I believe this clue is a double definition.
'drink' is the first definition.
(a small alcoholic drink)
'child' is the second definition.
(term for a young child)
(Other definitions for tot that I've seen before include "Child; measure of spirits" , "Add up, aggregate" , "Add up like infant" , "Tiny child" , "two fingers, perhaps" .)