A state of pure chaos (4)
I believe the answer is:
peru
'a state' is the definition.
(I know that Peru is a South American country)
'pure chaos' is the wordplay.
'chaos' indicates an anagram.
'pure' anagrammed gives 'PERU'.
'of' acts as a link.
(Other definitions for peru that I've seen before include "Machu Picchu country" , "Homeland of Paddington Bear" , "Mario Vargas Llosa's country" , "South American state" , "Land of the Incas" .)