Student contributes to vision (5)

I believe the answer is:

pupil

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

I can't explain the rest of the clue.

(Other definitions for pupil that I've seen before include "Learner in the eye?" , "Centre of iris, in the eye" , "Trainee barrister" , "Schoolchild; part of eye" , "Eye's centre" .)

I've seen this clue in The Daily Express.

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