Chaos or confusion (5)
I believe the answer is:
havoc
This clue is a double definition.
'chaos' is the first definition.
(I've seen this before)
'confusion' is the second definition.
(I've seen this before)
(Other definitions for havoc that I've seen before include "Violent and needless disturbance" , "Widepsread destruction" , "Carnage" , "Chaotic devastation" , "desolation" .)