Become very angry (3,3)
I believe the answer is:
see red
'become very angry' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for see red that I've seen before include "Become enraged" , "Be suddenly angry, as bull might" , "Lose the head as bull might" , "Lose one's temper" , "Become angry like bull" .)