Toy that gives you endless repetition (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 the rest of the clue.

(Other definitions for yo-yo that I've seen before include "Toy again in fashion" , "Child's toy on a string" , "An up-and-down toy on a string" , "Ma perhaps" , "Toy that rises and falls" .)

I've seen this clue in The Globe and Mail.

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