Crossword Genius

Case following punishment that's found on pitch (7,3)

Ross

I believe the answer is:

penalty box

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

'found on pitch' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'case following punishment' is the wordplay.
'case' becomes 'box' (boxing is a kind of casing).
'following' is a charade indicator (letters next to each other).
'punishment' becomes 'penalty' (synonyms).
'box' put after 'penalty' is 'PENALTY BOX'.

'that's' acts as a link.

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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