Fashionable dance music (3-3)
I believe the answer is:
hip-hop
'music' is the definition.
(genre of music)
'fashionable dance' is the wordplay.
'fashionable' becomes 'hip' (I've seen this in another clue).
'dance' becomes 'hop' (hop is a kind of dance).
'hip'+'hop'='HIP-HOP'
(Other definitions for hip-hop that I've seen before include "Genre of 1980s and '90s African-American music" , "Electronic rap music" , "Popular music style" , "Pop. music movement" .)