Kid's toy gun's broken with little hesitation (9)
I believe the answer is:
youngster
'kid's' is the definition.
('youngster' can be a synonym of 'kid')
'toy gun's broken with little hesitation' is the wordplay.
'broken' is an anagram indicator.
'with' is a charade indicator (letters next to each other).
'little hesitation' becomes 'er'.
'toy'+'guns'='toyguns'
'toyguns' is an anagram of 'youngst'.
'youngst'+'er'='YOUNGSTER'
(Other definitions for youngster that I've seen before include "Tiddler" , "Stripling" , "Rug rat in New York" , "Juvenile" , "tyke" .)