“Well, ___-di-dah!”

The crossword question is asking for a three-letter word that completes the phrase “Well, ___-di-dah!“, and the answer is LAH. This phrase is known for being an expression of contempt or scorn towards someone who is being pretentious or snobbish. The phrase itself is often associated with the stereotype of the upper class or aristocracy, who are known for using ornate language and manners to demonstrate their superiority. So, the answer to the crossword question is LAH, which is a musical term for a note that is often used as a vocal expression of superiority or disdain.