Go over teacher's negative feedback (5)
I believe the answer is:
cross
I believe this clue is a double definition.
'go over' is the first definition.
(to cross over)
'teacher's negative feedback' is the second definition.
(a cross marks work as incorrect)
(Other definitions for cross that I've seen before include "something to be endured" , "Grouchy" , "Mad" , "religious symbol" , "Sign - angry" .)