Performer in topless bar, model to pose bent over (6)
I believe the answer is:
artist
'performer' is the definition.
(eg a musician)
'topless bar model to pose bent over' is the wordplay.
'topless' means to remove the first letter.
'model' becomes 'T' (Ford Model T car).
'to pose' becomes 'sit' (synonyms).
'bent over' says the letters should be written in reverse.
't'+'sit'='tsit'
'tsit' in reverse letter order is 'tist'.
'bar' with its first letter removed is 'ar'.
'ar'+'tist'='ARTIST'
'in' acts as a link.
(Other definitions for artist that I've seen before include "Skilled person" , "Painter, sculptor etc" , "One engaged in painting" , "Traits (anag)" , "Model employer, perhaps" .)