Nip or nipper (3)

I believe the answer is:

tot

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'nipper' is the definition.
(I know that tot is a type of nipper)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tot that I've seen before include "Add; young child" , "Add the little child?" , "slug?" , "Small drink - young child" , "Tiny child" .)

I've seen this clue in The Irish News.

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