Interior layout and furnishings (5)
I believe the answer is:
decor
'interior layout and furnishings' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for decor that I've seen before include "Scheme of interior furnishings" , "Style of furnishing etc used in room" , "Furnishings and colours of a room" , "furnishings required" , "Style of furnishings, drapes etc used in a room" .)