Fiddle (with) (3)
I believe the answer is:
toy
'fiddle with' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for toy that I've seen before include "A child's plaything" , "Child's amusement" , "Trifle or dally with" , "Trifle with plaything?" , "Miniature (dog)" .)