Drink, little one (3)
I believe the answer is:
tot
I believe this is a double definition.
'drink' is the first definition.
(a small alcoholic drink)
'little one' is the second definition.
(I've seen this in another clue)
(Other definitions for tot that I've seen before include "Party drink" , "A wee dram" , "Get the sum for the toddler" , "quick drink" , "Calculate" .)