Decorator (5)
(Other definitions for tiler that I've seen before include "Worker who lays small squares" , "Masons' doorkeeper" , "High-level operator" , "Roof-worker" , "Craftsman" .)
'decorator' is the definition.
(synonyms)
This is all the clue.
(Other definitions for interior that I've seen before include "The inside of anything" , "Situated inside" , "The heart" , "Private" , "Inside of a building" .)