Crossword Genius

Find yourself something to do while in prison? (4,2,4)

Ross

I believe the answer is:

fill in time

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

'find yourself something to do while' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'in prison?' is the wordplay.
I cannot really see how this works, but
'in' is within the answer.
'prison?' could be 'time' (as in a spell in prison) and 'time' is present in the answer.
The remaining letters 'fill' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

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