Crossword Genius

Maths problem (3)

Ross

I believe the answer is:

sum

'maths problem' is the definition.
(a sum is an arithmetic problem)

This is the entire clue.

(Other definitions for sum that I've seen before include "Total; problem" , "Whole" , "Amount of money; total" , "Amount of money; add" , "An additional problem" .)

I've seen this clue in The Times, The Sun and The Mirror.
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