The answer to the crossword puzzle is 'ACE', which stands for the Aria Casino and Entertainment, the biggest club in Las Vegas. The Aria Casino and Entertainment is a luxury resort and casino located on the Las Vegas Strip in Paradise, Nevada. It is owned by MGM Resorts International and was opened in 2009. It features a 150, 000-square-foot casino, a spa, a pool, and a variety of restaurants and bars. The Aria Casino and Entertainment is one of the most popular destinations in Las Vegas, and it is known for its luxurious amenities and entertainment offerings.