Add a little rum (3)

I believe the answer is:

tot

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'add' is the definition.
(I know that add can be written as tot)

I don't understand how the remainder of the clue works.

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(Other definitions for tot that I've seen before include "Tiny child" , "Add; young child" , "Youngster; short drink" , "Add; small child" , "Aggregate for infant" .)

I've seen this clue in The Globe and Mail.

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