Crossword Genius

Optical membrane (6)

Ross

I believe the answer is:

eyelid

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">optical membrane</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for eyelid that I've seen before include "Covering for 27 across" , "Covering for organ of sight" , "Natural optical protector" , "Ocular closer" , "Optical membrane" .)

I've seen this clue in The Times.
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