Monocle (4)

I believe the answer is:

lens

'monocle' 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 "French town" , "Optical refractor" , "Transparent optical device" , "Light-focusing device" , "Optical device using light to form images" .)

I've seen this clue in The Sun.

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