Saffron (6)
I believe the answer is:
crocus
'saffron' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for crocus that I've seen before include "Bloomer" , "Spring plant" , "Occurs (anag.)" , "Occurs (anagram)" , "'Spring flower, source of saffron (6)'" .)