Othello's back room? (4)
I believe the answer is:
moor
'othello's' is the definition.
(Shakespeare's Othello is a Moor)
'back room?' is the wordplay.
'back' says the letters should be written in reverse.
'room' back-to-front is 'MOOR'.
(Other definitions for moor that I've seen before include "Ground that's high" , "fell in > dock" , "eg Ilkley, Othello" , "Secure boat with ropes" , "Large area of open, uncultivated land" .)