Sweet-sounding (6)
I believe the answer is:
dulcet
'sweet-sounding' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dulcet that I've seen before include "Agreeable and soothing to the ear" , "Mellifluous, pleasant to the ear" , "Of voice or tone, sweet-sounding" , "Soft and pleasant sounding" , "Harmonious, melodious" .)