MARINADE¾ cup red wine vinegar½ cup catsup¼ cup salad oil1½ tablespoons salt¾ teaspoon pepper¾ teaspoon dry mustard¾ teaspoon celery salt¼ teaspoon garlic salt¼ teaspoon dried thyme leaves¼ teaspoon cloves 5-or-6-lb sirloin steak, 2 inches thick MADEIRA SAUCE¼ cup unsifted all-purpose flour1 can (10½ oz) condensed beef broth, undiluted½ cup Madeira