Crossword Genius

Visual aid designed for single pupil (7)

Ross

I believe the answer is:

monocle

'visual aid' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'designed for single pupil' is the wordplay.
I cannot really see how this works, but
'single' could be 'mono' (prefix meaning single) and 'mono' is present in the answer.
'pupil' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is found within the answer.
This explanation may well be incorrect...

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

I've seen this clue in The Times.
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