Guitar sound (5)
I believe the answer is:
twang
'guitar sound' 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 "ringing sound" , "Sound of elastic being plucked" , "The Sound of Music?" , "A nasal intonation in speech, or sound of guitar" , "Sharp vibrating sound" .)