Children’s toy on a string (2-2)

I believe the answer is:

yo-yo

(Other definitions for yo-yo that I've seen before include "An up-and-down toy on a string" , "Toy - fluctuate wildly" , "Toy consisting of a reel and string" , "Toy that rises and falls" , "produces toy" .)

I've seen this clue in The Times.

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