Fit of bad temper (7)
I believe the answer is:
tantrum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fit of bad temper</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tantrum that I've seen before include "Burst of rage" , "Burst of temper" , "petulant outburst" , "Fit of childish temper" , "Childish fit of rage" .)