Crossword Genius

Inside job? (8,9)

Ross

I think it could be either:

Which length description are you looking for?:

6,7

8,9

prison officer

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

'job?' is the definition.
(I know that prison officer is a profession)

'inside' is the wordplay.
I cannot quite understand how this works, but
'inside' could be 'prison' (being 'inside' is being in prison) and 'prison' is located in the answer.
The remaining letters 'officer' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for prison officer that I've seen is " Warder".)

I've seen this clue in The Guardian.
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