Mournful music (5)
I believe the answer is:
dirge
'mournful music' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dirge that I've seen before include "A slow mournful song, lament for the dead" , "Slow, sad song" , "dreary tune" , "Funereal hymn" , "Lamentation" .)