Crossword Genius

Metal policeman (6)

Ross

I believe the answer is:

copper

I believe this is a double definition.

'metal' is the first definition.
(copper is a kind of metal)

'policeman' is the second definition.
(copper can informally mean a police officer)

(Other definitions for copper that I've seen before include "peeler" , "One who nicks" , "Reddish-brown metallic element" , "Metallic element and British bobby" , "Atomic number 29" .)

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