Pertaining to the eye (6)
I believe the answer is:
ocular
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pertaining to the eye</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ocular that I've seen before include "Eyepiece" , "Connected with vision (med.)" , "Glaucoma's such" , "Of the eye - visible" , "Viewer" .)