Fit of bad temper (7)
I believe the answer is:
tantrum
'fit of bad temper' is the definition.
(I've seen this before)
This is the entire clue.
(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" .)