Sudden outbreak (of anger) (5-2)
I believe the answer is:
flare-up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden outbreak of anger</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 flare-up that I've seen before include "Sudden burst of light" , "Burst into flame or become suddenly angry" , "Suddenly get angry" , "Sudden outburst" , "Explosion of emotion" .)