Greenish-brown eye color (5)
I believe the answer is:
hazel
'greenish-brown eye color' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hazel that I've seen before include "Cob (nut)" , "Catkin shrub" , "Nut tree" , "Shrub called the cob, which yields nuts" , "Tree - greenish-brown" .)