Olive-brown (5)
I believe the answer is:
khaki
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">olive-brown</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for khaki that I've seen before include "Dullish brown colour" , "Olive drab" , "Yellowish brown colour" , "Uniform shade" , "Army uniform colour" .)