Crossword Genius

Fluctuate like a plaything (2-2)

Ross

I believe the answer is:

yo-yo

This clue is a double definition.

'fluctuate' is the first definition.
(I've seen this before)

'a plaything' is the second definition.
(yo-yo is a kind of plaything)

'like' is the link.

(Other definitions for yo-yo that I've seen before include "Child's toy on a string" , "Ma perhaps" , "Toy made to rise and fall on string" , "Move up and down" , "An up-and-down toy on a string" .)

I've seen this clue in The Mirror.
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