Greenish eye color (5)
I believe the answer is:
hazel
'greenish 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 "Type of nut" , "Catkin-bearing shrub" , "Tree with catkins" , "Catkin-bearing tree" , "Catkin shrub" .)