Crocus (7)
I believe the answer is:
saffron
'crocus' is the definition.
(I know that saffron is a type of crocus)
This is all the clue.
(Other definitions for saffron that I've seen before include "Orange-yellow spice" , "Spice from crocus" , "Culinary spice" , "Spice from crocuses" , "Golden yellow" .)