making a predetermined series of steps and body movements in time to music. 11 letters .E...I.H...
Terpsichore fits, but does not match the clue. Problem is, the clue setter quite often gets things wrong.
********** has a point: Terpsichore was the muse of dance - the dictionary doesn't support the name being used to mean dancing itself (obviously there's the adjective terpsichorean too). I agree - dodgy clue.