Yellowish-green colour (5)
I believe the answer is:
olive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">yellowish-green colour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for olive that I've seen before include "Bitter fruit" , "woman" , "Oily stone fruit" , "Oil-yielding tree" , "One [TYPE OF TREE] is from the Mediterranean" .)