Pitch of a voice (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
tone
'pitch of a voice' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tone that I've seen before include "Pitch of a voice" , "Shade" , "Sound signal on a telephone" , "Note as in voice" , "Note; note (anag.)" .)