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Fine, perhaps, to fight where shootout occurs? (7,3)

Ross

I believe the answer is:

penalty box

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'where shootout occurs?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'fine perhaps to fight' is the wordplay.
'fine perhaps' becomes 'penalty' (fine is a kind of penalty).
'to fight' becomes 'box' (boxing is a kind of fighting).
'penalty'+'box'='PENALTY BOX'

Can you help me to learn more?

(Other definitions for penalty box that I've seen before include "area spotted?" , "Spot container" .)

I've seen this clue in The Telegraph.
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