Nanny's charge (3)
I believe the answer is:
tot
'nanny's charge' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tot that I've seen before include "Add; young child" , "Youngster; short drink" , "two fingers, perhaps" , "Small drink; accumulate" , "Get the sum for the toddler" .)