Preheat oven to 350ºF. Slice the top quarter off of the bread. Hollow out bottom and top of the bread, leaving a 1/2-inch shell. Use the bread you pull out for croutons or bread crumbs. Set bread shell aside. Combine cranberry sauce, celery, garlic, basil and vinegar in a small mixing bowl. Spread in bottom of shell and top of bread. Place half of the onion slices in bottom of bread. Top with 1/2 cup of cheese. Layer turkey on top. Spread remaining cheese over turkey and top with remaining onion. Place top on bread. Wrap loaf in foil. Bake for 30 minutes or until heated through. Remove from oven and let stand for about 5 minutes. Unwrap; cut into wedges and serve. Makes 4-6 servings.