Crossword Genius

Policeman's a poser in pictures (5)

Ross

I believe the answer is:

rebus

This clue is a double definition.

'policeman's' is the first definition.
(fictional detective John Rebus)

'a poser in pictures' is the second definition.
(picture-based puzzle)

(Other definitions for rebus that I've seen before include "Visual type of word puzzle" , "Puzzling device" , "Pun picture puzzle" , "Enigmatic representation" , "Word puzzle involving pictures" .)

I've seen this clue in The Guardian.
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