Dead excited? (10)
I believe the answer is:
breathless
I believe this clue is a double definition.
'dead' is the first definition.
(similar in meaning)
'excited?' is the second definition.
(thesaurus)
(Other definitions for breathless that I've seen before include "Short-winded" , "Still" , "Spent" , "panting?" , "Gasping for air" .)