Crossword Genius

Do some sums (3)

Ross

I believe the answer is:

add

'do some sums' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for add that I've seen before include "Sum (numbers)" , "Go further" , "what a computer can do" , "Give more" , "Combine (numbers)" .)

I've seen this clue in the LA Times, the Wall Street Journal, the L.A. Times Daily and the Universal.
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