Such a vocal part brings chaos (5)
I believe the answer is:
havoc
'chaos' is the definition.
(I've seen this before)
'such a vocal part' is the wordplay.
'part' says the answer is hidden in the clue.
'HAVOC' is hidden in the letters of 'such a vocal'.
'brings' acts as a link.
(Other definitions for havoc that I've seen before include "Widepsread destruction" , "Chaotic devastation" , "desolation" , "Violent and needless disturbance" , "Total destruction" .)