Sharp vibrating sound (5)
I believe the answer is:
twang
'sharp vibrating sound' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for twang that I've seen before include "Nasal tone or sound of plucked string" , "Nasal or musical sound" , "Harsh sound of plucked string" , "Distinctive nasal style of pronunciation" , "Plucking sound - nasal tone" .)