Disgusted at USA need for change (9)
I believe the answer is:
nauseated
'disgusted' is the definition.
('nauseate' can be a synonym of 'disgust')
'at usa need for change' is the wordplay.
'for change' indicates an anagram (I've seen this in other clues).
'at'+'usa'+'need'='atusaneed'
'atusaneed' is an anagram of 'NAUSEATED'.
(Other definitions for nauseated that I've seen before include "Revolted" , "Sickened" , "Disgusted" .)