Crossword Genius

He finds criminals working for the police (9)

Ross

I believe the answer is:

detective

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

'he finds criminals working for the police' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'he' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ive' and 'ive' is located in the answer.
The remaining letters 'detect' 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?

(Other definitions for detective that I've seen before include "police officer" , "Expert solver of clues" , "Policeman, say" , "Private or police investigator" , "Criminal investigator" .)

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