Plaything most of you duplicated (2-2)

I believe the answer is:

yo-yo

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'plaything' is the definition.
(I know that yo-yo is a type of plaything)

I can't explain the remainder of the clue.

(Other definitions for yo-yo that I've seen before include "Ma perhaps" , "Toy consisting of a spool and string" , "Toy (with ups-and-downs!)" , "Go up and down many times" , "Toy consisting of a reel and string" .)

I've seen this clue in The Sun.

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