Room's lower surface (5)
I believe the answer is:
floor
(Other definitions for floor that I've seen before include "Inside horizontal surface" , "Lower limit" , "at bottom of forest" , "Puzzle" , "Bottom surface" .)
I believe the answer is:
floor
(Other definitions for floor that I've seen before include "Inside horizontal surface" , "Lower limit" , "at bottom of forest" , "Puzzle" , "Bottom surface" .)