Nasal accent (5)
I believe the answer is:
twang
'nasal accent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for twang that I've seen before include "Nasal tone of voice" , "Nasal tone or sound of plucked string" , "Sharp vibrating sound" , "Plucked string sound; nasal voice" , "accent's nasal sound" .)