Exhibitionist— rose up (anag) (6)

I believe the answer is:

poseur

(Other definitions for poseur that I've seen before include "One shows off to impress" , "Pretentious type" , "Person habitually pretending to be something he is not" , "Attitudiniser (Fr.)" , "Person who strikes attitudes, a show-off" .)

I've seen this clue in The Guardian.

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