Place where they fight cartels (5)

I believe the answer is:

rings

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'cartels' is the definition.
The definition and answer can be both groups as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for rings that I've seen before include "Encircles" , "They fix the markets" , "jewellery" , "that may circle planet (not ours)" , "See 12" .)

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

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