Nasal tone (5)
I believe the answer is:
twang
'nasal tone' 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 "A nasal intonation in speech, or sound of guitar" , "Strongly nasal quality in speech" , "Nasal tone of voice" , "Pluck (a string)" , "Sound of a tense wire or bowstring being plucked" .)