Crossword Genius

Firm with quiet lawman (3)

Ross

I believe the answer is:

cop

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'lawman' is the definition.
(cop is a kind of lawman)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cop that I've seen before include "Policeman (colloq.)" , "Get" , "Policeman (informal)" , "Police officer (informal)" , "busy" .)

I've seen this clue in The Mirror.
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