Entertainer impersonating famous painter maybe? (13)
I believe the answer is:
impressionist
This clue is a double definition.
'entertainer impersonating' is the first definition.
(someone who does impressions)
'famous painter maybe?' is the second definition.
(impressionist is a type of artist)
(Other definitions for impressionist that I've seen before include "Person pretending to be another" , "Is he taking off" , "one good at doing copies?" , "artist?" , "Painter such as Monet" .)