Crossword Genius

Inside man (8)

Ross

I believe the answer is:

prisoner

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

'inside man' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'inside man' is the wordplay.
'inside' becomes 'prison' (being 'inside' is being in prison).
'man' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'prison'+'er'='PRISONER'

Can you help me to learn more?

(Other definitions for prisoner that I've seen before include "Person behind bars" , "Incarcerated person" , "One in gaol" , "Person held captive as by law" , "Senior PR (anag) - one in detention" .)

I've seen this clue in The Globe and Mail.
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