Something to start young with (3)
I believe the answer is:
toy
'something to start young with' is the definition.
I can't judge whether this definition defines the answer.
'to start young with' is the wordplay.
I cannot quite see how this works, but
'to' is within the answer.
'young' could be 'y' and 'y' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for toy that I've seen before include "Teddy or Dolly" , "Object for a child to play with" , "Child's amusement" , "Trifle or dally with" , "Doll or teddy, say" .)