Cop in male form (9)

I believe the answer is:

policeman

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

'cop in male form' is the definition.
'policeman' can be an answer for 'cop' (I've seen this in another clue). I am unsure of the 'in male form' bit.

'cop in male form' is the wordplay.
'form' is an anagram indicator (another form of the letters).
'cop'+'in'+'male'='copinmale'
'copinmale' anagrammed gives 'POLICEMAN'.

Can you help me to learn more?

(Other definitions for policeman that I've seen before include "Member of the force" , "Bobby" , "He's responsible for the maintenance of public order" , "Law enforcer" , "Open claim (anag.)" .)

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

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