A uniform colour (5)
I believe the answer is:
khaki
I believe this clue is a double definition.
'a uniform' is the first definition.
(I've seen this before)
'colour' is the second definition.
(I have seen 'Military colour' mean 'khaki' so perhaps 'colour' could also mean 'khaki')
(Other definitions for khaki that I've seen before include "Dull brownish" , "Olive-drab colour" , "Military hue" , "Dust-coloured" , "Military camouflage colour" .)