Couple cartwheeling in boudoir? (3)
I believe the answer is:
duo
'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" .)