Hissy fit (7)
'hissy fit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tantrum that I've seen before include "Wobbly" , "Fit of childish temper" , "Childish display of temper" , "Burst of temper" , "petulant outburst" .)
'hissy fit' is the definition.
(I've seen this before)
This is the entire clue.
(Another definition for temper tantrum that I've seen is " Hissy fit".)