Crossword Genius

Couple cartwheeling in boudoir? (3)

Ross

I believe the answer is:

duo

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'couple' is the definition.
(I know that couple can be written as duo)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for duo that I've seen before include "Double act" , "Couple, pair" , "Pair of people/things" , "Musical work for two" , "Musical pair" .)

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