Youngsters someone might have in a panic (7)
I believe the answer is:
kittens
'youngsters someone might' is the definition.
I can't judge whether this definition defines the answer.
'have in a panic' is the wordplay.
'have' becomes 'kitten' (kittening is a kind of having).
'in a panic' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'kitten'+'s'='KITTENS'
Can you help me to learn more?
(Other definitions for kittens that I've seen before include "Have such pets" , "Young rabbits" , "Young cats" , "Feline young" , "Young felines" .)