Unbleached linen (4)
I believe the answer is:
ecru
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unbleached linen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ecru that I've seen before include "Unbleached-linen colour" , "Shade of unbleached linen" , "natural colour" , "Greyish-yellow colour" , "Neutral colour" .)