Childish fit of rage (7)
I believe the answer is:
tantrum
'childish fit of rage' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tantrum that I've seen before include "Childish fit of rage" , "Frenzy" , "Childish fit of anger" , "Childish angry outburst" , "throwing this?" .)