Nut; eye colour (5)
I believe the answer is:
hazel
I believe this is a double definition.
'nut' is the first definition.
(I've seen this in another clue)
'eye colour' is the second definition.
(I know that hazel is a eye colour)
(Other definitions for hazel that I've seen before include "Nut-bearing tree" , "Girl" , "Shrub called the cob, which yields nuts" , "Nut; girl's name" , "Catkin shrub" .)