Crossword Genius

Upcoming student’s mistake (4-2)

Ross

I believe the answer is:

slip-up

'mistake' is the definition.
(I know that slip-up is a type of mistake)

'upcoming student's' is the wordplay.
'upcoming' is a reversal indicator.
'student's' becomes 'pupil's' (pupil can mean a student at a school).
'pupils' back-to-front is 'SLIP-UP'.

(Other definitions for slip-up that I've seen before include "Mistake, blunder" , "Minor inadvertent mistake" , "Small error" , "Minor lapse" .)

I've seen this clue in The Times.
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