Revealer of the Wizard of Oz

The clue “Revealer of the Wizard of Oz is TOTO” refers to a character from the timeless classic movie “The Wizard of Oz“. Toto is a small terrier dog who accompanies the main character, Dorothy, on her journey to find the Wizard of Oz and return home. In the climax of the movie, Toto pulls back a curtain to reveal that the “great and powerful” Wizard of Oz is actually just a man using a machine to create illusions. This act of revealing the truth is what the crossword clue is referring to, as Toto is the one who ultimately exposes the Wizard as a fraud.