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