Draw back well-uphostered part (4)
I believe the answer is:
pull
'draw' is the definition.
(synonyms)
'back well-uphostered part' is the wordplay.
'back' says the letters should be written in reverse.
'part' says the answer is hidden in the clue.
'llup' is hidden in the letters of 'well uphostered'.
'llup' reversed gives 'PULL'.
(Other definitions for pull that I've seen before include "withdraw" , "Heave" , "Draw towards oneself" , "Tug; attraction" , "Attract as a customer" .)