Crossword Genius

An element of law enforcement (6)

Ross

I believe the answer is:

copper

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

'an element' is the definition.
(copper is a kind of element)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for copper that I've seen before include "Atomic number 29" , "Police officer (slang)" , "Busy" , "An element; small coin" , "Metal - police officer" .)

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