What a kid'll eat, in song (3)
I believe the answer is:
ivy
'what a kid'll eat in song' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ivy that I've seen before include "Song: 'Poison --'" , "Creeper plant" , "Trailer" , "With holly, it's seasonally decorative" , "Female" .)