Confusion, chaos (5)
I believe the answer is:
havoc
I believe this clue is a double definition.
'confusion' is the first definition.
(I've seen this before)
'chaos' is the second definition.
(I've seen this before)
(Other definitions for havoc that I've seen before include "Chaos, confusion" , "Pandemonium" , "Total destruction" , "Widespread destruction and great disorder" , "Ruin" .)