Crossword Genius

Student of vision? (5)

Ross

I believe the answer is:

pupil

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This could be a double definition.

'student' is the first definition.
(pupil can mean a student at a school)

'vision?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'of' is the link.

Can you help me to learn more?

(Other definitions for pupil that I've seen before include "One under instruction" , "Scholar" , "One in the eye or in place of learning" , "One being taught" , "bit of a looker" .)

I've seen this clue in The Daily Express and The Mirror.
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