Naively enthusiastic or idealistic (6-4)
I believe the answer is:
starry-eyed
I believe this clue is a double definition.
'naively enthusiastic' is the first definition.
(I've seen this before)
'idealistic' is the second definition.
(thesaurus)
(Other definitions for starry-eyed that I've seen before include "Romantically optimistic" , "Full of unsophisticated optimism" , "Naively enthusiastic" , "Naively idealistic" , "Out of touch with reality" .)