Odd cure for linen that's unbleached (4)
I believe the answer is:
ecru
'linen that's unbleached' is the definition.
'odd cure' is the wordplay.
'odd' indicates anagramming the letters.
'cure' is an anagram of 'ECRU'.
'for' acts as a link.
(Other definitions for ecru that I've seen before include "Unbleached-linen colour" , "Cure (anag) - unbleached linen" , "Buff or beige" , "Buff colour" , "natural colour" .)