The crossword solution for the term 'ONE WHO SAYS 'YOU WISH!'?' is GENIE, which is a five-letter word. A GENIE is a mythical creature from Arabian and Islamic mythology that is said to grant wishes to those who summon them. They are often depicted as having magical powers and living in bottles or lamps. The phrase 'You wish!' is often associated with genies, as it is a sarcastic response to someone's request for something impossible.