Staggered, US donated freely (9)
I believe the answer is:
astounded
'staggered' is the definition.
(thesaurus)
'us donated freely' is the wordplay.
'freely' indicates anagramming the letters.
'us'+'donated'='usdonated'
'usdonated' is an anagram of 'ASTOUNDED'.
(Other definitions for astounded that I've seen before include "Greatly surprised" , "Shocked" , "disconcerted" , "Knocked for six" , "Speechless" .)