Brawl at no cost to anyone (4-3-3)

I believe the answer is:

free-for-all

I'm a little stuck... Click here to teach me more about this clue!

'brawl' is the definition.
(I know that brawl can be written as free-for-all)

'no cost to anyone' is the wordplay.
'no cost' becomes 'free' (I've seen this in other clues).
'to anyone' becomes 'forall' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'free'+'forall'='FREE-FOR-ALL'

'at' is the link.

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.

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