Crossword Genius

Fights probably rigged (5)

Ross

I believe the answer is:

spars

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'fights' is the definition.
(sparring is a kind of fighting)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for spars that I've seen before include "disputes" , "Boxes" .)

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