Crossword Genius

Pretentious person rose up unexpectedly (6)

Ross

I believe the answer is:

poseur

'pretentious person' is the definition.
(I've seen this before)

'rose up unexpectedly' is the wordplay.
'unexpectedly' indicates anagramming the letters.
'rose'+'up'='roseup'
'roseup' anagrammed gives 'POSEUR'.

(Other definitions for poseur that I've seen before include "Person habitually pretending to be something he is not" , "Person who strikes attitudes, a show-off" , "Pretentious chap" , "Affected person, strikes attitudes" , "Uprose (anag.)" .)

I've seen this clue in The Times.
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