Dull and dirty (5)
I believe the answer is:
dingy
'dull and dirty' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dingy that I've seen before include "Dirty-looking, run-down" , "Drab and depressing" , "Gloomy, drab" , "Dismal" , "Grimy" .)