Baby's toy alarm (6)
I believe the answer is:
rattle
This clue could be a double definition.
'baby's toy' is the first definition.
(I've seen this in another clue)
'alarm' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
Can you help me to learn more?
(Other definitions for rattle that I've seen before include "American viper" , "Child's noisy toy" , "Clink; disconcert" , "Baby's toy - conductor" , "Child's toy; unsettle" .)