Total disarray (4)
'total disarray' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for chaos that I've seen before include "[MAYHEM]" , "Total disorder and confusion" , "Utter confusion" , "Bedlam" , "mess" .)
(Other definitions for mess that I've seen before include "Military dining area" , "dish" , "4 [DISORDER]" , "pickle" , "Where military personnel eat" .)