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Switch positions with Japanese singer, joining female duo (2-3)

Ross

I believe the answer is:

on-off

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'switch positions' is the definition.
(on and off are positions on a switch)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for on-off that I've seen before include "in bursts" , "Discontinuous" .)

I've seen this clue in the Sydney Morning Herald.
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