Students brought up to demonstrate human fallibility (4,2)
I believe the answer is:
slip up
'demonstrate human fallibility' is the definition.
I can't tell whether this defines the answer.
'students brought up' is the wordplay.
'students' becomes 'pupils' ('pupil' can be a synonym of 'student').
'brought up' says the letters should be written backwards (in a down clue, letters go up).
'pupils' in reverse letter order is 'SLIP-UP'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for slip up that I've seen before include "Make a mistake or lose footing aloft" , "Small error" , "Make a mistake, being unsteady on feet?" , "Minor inadvertent mistake" , "Mistake, blunder" .)