Upper surface of a room (7)

I believe the answer is:
ceiling
(Other definitions for ceiling that I've seen before include "Room's upper surface" , "upper limit on wages" , "likely to get plastered" , "Overhead surface" .)
I believe the answer is:
ceiling
(Other definitions for ceiling that I've seen before include "Room's upper surface" , "upper limit on wages" , "likely to get plastered" , "Overhead surface" .)