Top children’s toy to create current disturbance (4)

I believe the answer is:

eddy

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'current disturbance' is the definition.

I don't understand the rest of the clue.

(Other definitions for eddy that I've seen before include "Swirl, whirl" , "Founder of Christian Science, d. 1910" , "Founder of sect" , "She founded Christian Science in 1866, d. 1910" , "Swirling current" .)

I've seen this clue in The Times.

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