Become furious (3,3)
I believe the answer is:
see red
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">become furious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for see red that I've seen before include "Lose temper like enraged bull" , "Become angry (colloq.)" , "Be suddenly angry, as bull might" , "Become enraged" , "blow a gasket" .)