Upset with child's toy? (6)
I believe the answer is:
rattle
I believe this is a double definition.
'upset' is the first definition.
(I've seen this before)
'child's toy?' is the second definition.
(I've seen this before)
'with' is the link.
(Other definitions for rattle that I've seen before include "Irritating sound" , "Baby's toy - racket - disconcert" , "Baby's toy; sound of loose part" , "Venomous creature's warning" , "worry" .)