Cure using shade (4)
I believe the answer is:
ecru
'shade' is the definition.
(colour)
'cure using' is the wordplay.
'using' is an anagram indicator (the letters used in a different way).
'cure' anagrammed gives 'ECRU'.
(Other definitions for ecru that I've seen before include "Greyish white" , "Raw linen colour" , "Light fawn colour" , "Natural stuff" , "one of the colours" .)