Music player (6)
I believe the answer is:
stereo
'music player' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stereo that I've seen before include "Means of amplification of sound through two or more channels" , "Record-player" , "Music player with two speakers" , "Music-playing equipment giving depth of sound" , "Method of sound reproduction" .)