Viennese dance (5)
I believe the answer is:
'viennese dance' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for waltz that I've seen before include "Dance in three-four time" , "Ballroom dance in triple time" , "Last dance?" , "Three-time dance" , "A flowing melody or dance in triple time" .)