Crossword Genius

--- up, revise (O, not A) (4)

Ross

I believe the answer is:

swot

(Other definitions for swot that I've seen before include "One studying a lot" , "Very diligent student" , "Excessively studious pupil" , "Student who studies too hard" , "Very keen pupil" .)

I've seen this clue in The Times.
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