Crossword Genius

In Paris, my uncle loses second new visual aid (7)

Ross

I believe the answer is:

monocle

I'm a little stuck... Click here to teach me more about this clue!

'visual aid' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I can't see?

'in paris my uncle loses second new' is the wordplay.
I cannot quite understand how this works, but
'second' could be 'mo' (both are short periods of time) and 'mo' is located in the answer.
'new' could be 'n' and 'n' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for monocle that I've seen before include "optical device" , "lens" , "One-lens seeing apparatus" , "Single eyeglass" , "Reading glass for one eye only" .)

I've seen this clue in The Telegraph.
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