Dreamer (5)
(Other definitions for idler that I've seen before include "stationary car perhaps?" , "who makes no effort" , "Layabout; ship crewman not on watch" , "Laggard" , "Lazybones; gear wheel" .)
(Other definitions for idealist that I've seen before include "Detail is about person with aspirations toward perfection (8)" , "One who pursues the perfect" , "Person with high and unselfish standards" , "Impractical person" , "Details I accumulated about person with best intentions" .)
'dreamer' is the definition.
(synonyms)
This is all the clue.
(Other definitions for escapist that I've seen before include "One who lives in dreamland, a fantasist" , "One fleeing reality" , "My interest is not of this world" , "I fantasise" , "One indulging in fantasy" .)
'dreamer' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for walter mitty that I've seen before include "Dreamer" , "fictional character" , "fanciful sort" , "Thurber's fictional fantasist" , "Thurber character - one who fantasises" .)