Crossword Genius

Appropriate zone stops kick out-of-bounds (2,5)

Ross

I believe the answer is:

on topic

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

'appropriate zone stops kick' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'out-of-bounds' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'bounds' could be 'top' (top is a kind of bounds) and 'top' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

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