Sound cut-off to chew over (5)
I believe the answer is:
twang
'sound' is the definition.
(I know that twang is a type of sound)
'cut-off to chew over' is the wordplay.
'cut off' means to remove the last letter.
'chew' becomes 'gnaw' (gnawing is a kind of chewing).
'over' is a reversal indicator.
'gnaw' backwards is 'wang'.
'to' with its last letter taken away is 't'.
't'+'wang'='TWANG'
(Other definitions for twang that I've seen before include "Sort of sound" , "Sound of plucked string (or certain dialects)" , "Plucked string sound; nasal voice" , "Sound of a tense wire or bowstring being plucked" , "brogue" .)