Disappointed, disillusioned (12)
I believe the answer is:
disenchanted
This clue is a double definition.
'disappointed' is the first definition.
(disenchanting is a kind of disappointing)
'disillusioned' is the second definition.
(similar in meaning)
(Other definitions for disenchanted that I've seen before include "Saddened by frustrated expectations" , "Having lost one's fascination" , "Let down" .)