Nut; eye colour (5)
I believe the answer is:
hazel
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">nut</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">eye colour</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that hazel is a eye colour)</span><br/ ><br/ ></span>
(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" .)