Crossword Genius

Parent with head lowered getting tot up (3)

Ross

I believe the answer is:

add

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'tot up' is the definition.
(synonyms)

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

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(Other definitions for add that I've seen before include "Include" , "problem for hyperactive children" , "Give more" , "put two and two together" , "Put together - append" .)

I've seen this clue in The Independent.
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