Unbleached color (4)
I believe the answer is:
ecru
'unbleached color' is the definition.
'ecru' can be an answer for 'color' (ecru is a kind of color). I also know that 'unbleached' relates to this answer.
This is the entire clue.
(Other definitions for ecru that I've seen before include "one of the colours" , "No bright colour" , "light beige" , "The Color" , "Greyish-yellow colour" .)