Once popular dancing turn (5)
I believe the answer is:
twist
'turn' is the definition.
('twist' can be a synonym of 'turn')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for twist that I've seen before include "Who could ask for more!" , "See 1" , "Sprain, turn, wrench" , "Bend, distort" , "Turn into a distorted shape" .)