Daydreamer (8)
I believe the answer is:
escapist
'daydreamer' is the definition.
(I know that escapist is a type of daydreamer)
This is the entire clue.
(Other definitions for escapist that I've seen before include "One who lives in dreamland, a fantasist" , "My interest is not of this world" , "One indulging in fantasy" , "One who habitually fantasises" , "One avoiding reality" .)