Dusty sort of room (5)
I believe the answer is:
study
'room' is the definition.
(I know that study is a type of room)
'dusty sort' is the wordplay.
'sort' indicates anagramming the letters.
'dusty' is an anagram of 'STUDY'.
'of' is the link.
(Other definitions for study that I've seen before include "See 11" , "Read: den" , "Dusty (anag.)" , "Den; a practice drawing" , "Swot" .)