A fight without admission charges? (4-3-3)

I believe the answer is:

free-for-all

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'a fight' is the definition.
(a free for all is a fight or brawl)

I don't understand how the rest of the clue works.

(Other definitions for free-for-all that I've seen before include "Public brawl" , "Disorganised event" .)

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

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