Moving to music (7)
I believe the answer is:
dancing
'moving to music' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dancing that I've seen before include "Terpsichorean exercise" , "Strictly Come - - (TV)" , "Moving to music" , "Taking a series of rhythmical steps and movements in time to music" , "Performing ballet" .)