Crossword Genius

Optical glass (4)

Ross

I believe the answer is:

lens

'optical glass' is the definition.
(I've seen this in another clue)

This is all the clue.

(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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