Answer:

daydreamer

Answer	Crossword Clue
DAYDREAMER	Fantasizer, when the sun's up?
DAYDREAMER	One indulging in reverie
DAYDREAMER	One who woolgathers

DAYDREAMER	Builder of air castles.
DAYDREAMER	Builder of castles in the air.
DAYDREAMER	Castle builder.
DAYDREAMER	Walter Mitty, e.g.
DAYDREAMER	Woolgatherer

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.