Yo-yo or top (3)
I believe the answer is:
toy
'yo-yo or top' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toy that I've seen before include "Child's amusement" , "One of spelt out words" , "A child's plaything" , "Trifle with plaything?" , "Small breed" .)