Catch officer (3)

I believe the answer is:

cop

I believe this is a double definition.

'catch' is the first definition.
(I've seen this before)

'officer' is the second definition.
(cop is a kind of officer)

(Other definitions for cop that I've seen before include "catch" , "Short policeman" , "busy" , "Policeman (slang)" , "An American policeman" .)

I've seen this clue in The Times.

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