Crossword Genius

A mans viewing-aid (4)

Ross

I believe the answer is:

lens

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for lens that I've seen before include "Part of telescope" , "Bit of a looker" , "City of northern France: periscope part" , "Refracting device" , "Camera component" .)

I've seen this clue in The Irish Independent.
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