With this sort of mop I clean copper (9)

I believe the answer is:

policeman

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

'copper' is the definition.
(I know that copper can be written as policeman)

'with this sort of mop i clean' is the wordplay.
'mop i clean' can be anagrammed to 'POLICEMAN'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for policeman that I've seen before include "Constable" , "Rozzer" , "Open claim (anag.)" , "Member of the force" , "Copper" .)

I've seen this clue in the Sydney Morning Herald.

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