Exhibitionist regrets surgery after lift (6)
I believe the answer is:
poseur
'exhibitionist' is the definition.
(poseur is a kind of exhibitionist)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for poseur that I've seen before include "One who strikes attitudes, a phoney" , "One seeking to impress others with affected style" , "Person habitually pretending to be something he is not" , "One putting on airs" , "One who strikes an attitude to impress" .)