Baby's toy (6)
I believe the answer is:
rattle
'baby's toy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rattle that I've seen before include "Baby's toy - racket - disconcert" , "making one upset" , "Clink; disconcert" , "Baby's toy; sound of loose part" , "Make worried, baby's toy" .)