In an excited state (8)
(Other definitions for aflutter that I've seen before include "in excited state" , "is rather nervous" , "Agitated - excited (eg in anticipation)" , "Nervous, twitchy" , "trembling" .)
(Other definitions for eager that I've seen before include "Whole-hearted" , "really keen" , "Enthusiastic, agog" , "Agree (anag.)" , "Impatient" .)