Crossword Genius

Optical glass (4)

Ross

I believe the answer is:

lens

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

(Other definitions for lens that I've seen before include "Bender of beams" , "Focussing glass" , "Part of the inner eye, or camera" , "Dark cloud; shining light" , "Piece of glass, usually curved" .)

I've seen this clue in The Times and the Penny Press.
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