It might help you to see a French city (4)

I believe the answer is:

lens

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'a french city' is the definition.
(Lens is a French city)

I can't explain the rest of the clue.

(Other definitions for lens that I've seen before include "town in France" , "Refracting device" , "Part of the inner eye, or camera" , "Focusing glass" , "Piece of glass in optical instrument" .)

I've seen this clue in The Guardian.

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