Fantasy (8)
'fantasy' is the definition.
(I know that fantasy can be written as illusion)
This is the entire clue.
(Other definitions for illusion that I've seen before include "False impression" , "Fantasy or mirage" , "Deceptive impression" , "can you believe it?" , "Mocking old" .)
'fantasy' is the definition.
(I know that dream is a type of fantasy)
This is all the clue.
(Other definitions for dream that I've seen before include "Reverie or nightmare" , "Somniate" , "Trance" , "Fantasise, imagine" , "Fantasy; ideal" .)
'fantasy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for make-believe that I've seen before include "Fantasy" , "Pretence" .)