But not how boxers settle matters (6)

I believe the answer is:

clinch

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'settle matters' is the definition.
'clinch' can be an answer for 'settle' (thesaurus). I am unsure of the 'matters' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for clinch that I've seen before include "Grapple - confirm" , "Fierce embrace" , "Drive home (an argument)" , "Passionate embrace" , "Settle conclusively with informal embrace" .)

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

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