A Chopin piece. (It's a dance) (3)
I believe the answer is:
hop
'it's a dance' is the definition.
(hop is a kind of dance)
'a chopin piece' is the wordplay.
'piece' indicates the answer is hidden within the clue.
'HOP' can be found hidden inside 'chopin'.
(Other definitions for hop that I've seen before include "Dried flower; jump" , "1950s dance event" , "Leap on one leg" , "Move as a frog" , "Jump about on one leg" .)