Chaos, confusion (5)
I believe the answer is:
havoc
I believe this 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 "Total destruction" , "Chaos, confusion" , "Mayhem" , "Pandemonium" , "Violent and needless disturbance" .)