Colour of boot locker, some say (5)

I believe the answer is:

khaki

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'colour' is the definition.
(I have seen 'Military colour' mean 'khaki' so perhaps 'colour' could also mean 'khaki')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for khaki that I've seen before include "Military uniform cloth - colour" , "Sand-coloured" , "Uniform shade" , "strong fabric" , "Yellowish brown (used by military)" .)

I've seen this clue in The Independent.

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