Dust-coloured; military uniform (5)
I believe the answer is:
khaki
I believe this clue is a double definition.
'dust-coloured' is the first definition.
(I've seen this before)
'military uniform' is the second definition.
(I've seen this in another clue)
(Other definitions for khaki that I've seen before include "Military uniform's cloth" , "Yellowish brown colour" , "Military clothes" , "Dust-coloured" , "Army fabric" .)