It comes between opposing sides (6)

I believe the answer is:

versus

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'opposing sides' is the definition.
'versus' can be an answer for 'opposing'. I am not certain of the 'sides' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for versus that I've seen before include "playing" , "Opposed to" , "Set against" , "Against (another team)" , "Against (opponent)" .)

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

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