Crossword Genius

Individual lawyer on the box (5,5)

Ross

I believe the answer is:

perry mason

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

'lawyer on the box' is the definition.
'perry mason' can be an answer for 'lawyer' (I've seen this in another clue). I'm unsure of the 'on the box' bit.

'individual' is the wordplay.
I cannot quite understand how this works, but
'individual' could be 'mason' (Mason is an example) and 'mason' is present in the answer.
The remaining letters 'perry' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for perry mason that I've seen before include "Counsel" , "TV lawyer" .)

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