Beefy Macaroni

1 1/2 cups uncooked elbow macaroni
1 lb ground beef
1/2 cup chopped onion
10 3/4 ounces tomato soup
1/4 cup water
1 tablespoon worcestershire sauce
1/2 cup shredded cheddar cheese
--Cook macaroni according to package directions. Drain and set aside. In medium skillet, over medium-high heat, cook beef and onion until beef is browned. Stir often to seperate meat. Drain. Return beef to skillet and add soup, water, worcestershire, cheese,and macaroni. Heat on low until heated through.