Crossword Genius

In old slang, a police officer (10)

Ross

I believe the answer is:

bluebottle

(Other definitions for bluebottle that I've seen before include "An insect; Goon character" , "member of force" , "Flier" , "Common blowfly" , "Large fly -- wild cornflower" .)

I've seen this clue in The Times and The Sunday Times.
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