Dramatic piano passage (9)
I believe the answer is:
glissando
'dramatic piano passage' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for glissando that I've seen before include "Sliding series of notes (mus.)" , "Sliding effect in moving from one musical note to another" , "trombone slide, for example" , "(Musically) a rapid series of ascending or descending notes" , "note series rapidly executed" .)