Crossword Genius

Reviewing student's mistake (4,2)

Ross

I believe the answer is:

slip up

'mistake' is the definition.
(slipping up is a kind of mistaking)

'reviewing student's' is the wordplay.
'reviewing' says the letters should be written in reverse (I've seen 'reviewed' mean this).
'student's' becomes 'pupil's' ('pupil' can be a synonym of 'student').
'pupils' written backwards gives 'SLIP-UP'.

(Other definitions for slip up that I've seen before include "Pupils (anag.)" , "Make a mistake, being unsteady on feet?" , "one fielder close to the wicket?" , "Mistake, blunder" , "get it wrong" .)

I've seen this clue in the Sydney Morning Herald.
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