Toy you twice left unfinished (2-2)

I believe the answer is:

yo-yo

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

I don't understand how the remainder of the clue works.

(Other definitions for yo-yo that I've seen before include "Child's toy on a string" , "Toy consisting of a reel and string" , "An up-and-down toy on a string" , "Spinning toy" , "Toy (with ups-and-downs!)" .)

I've seen this clue in The Times.

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