Crossword Genius

Wrestler loses nothing in total (3)

Ross

I believe the answer is:

sum

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'total' is the definition.
(I know that total can be written as sum)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sum that I've seen before include "Whole" , "Total, add" , "Arithmetical problem" , "Mathematical problem" , "Add together" .)

I've seen this clue in The Sun.
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