Interior style (5)
I believe the answer is:
decor
'interior style' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for decor that I've seen before include "Room colour scheme, furnishings, etc" , "Embellishment of a room" , "Internal ornamentation" , "Style of furnishings, drapes etc used in a room" , "Scheme of interior furnishings" .)