Become enraged (3,3)
I believe the answer is:
see red
'become enraged' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for see red that I've seen before include "blow a gasket" , "Be annoyed" , "Lose temper like angry bull" , "Lose temper like raging bull" , "Burst a blood vessel" .)