Sudden outbreak (of anger) (5-2)
I believe the answer is:
flare-up
'sudden outbreak of anger' is the definition.
(I've seen this before)
This is all the clue.
(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" .)