Dull-looking (4)
I believe the answer is:
drab
'dull-looking' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for drab that I've seen before include "Dingy, dull" , "Drearily dull; slattern" , "kind of tart" , "Shabby; a slattern (arch.)" , "Cheerless, shabby" .)