Saute onion, celery and diced carrots in butter until soft and tender.   Place sauteed vegetables in a large stockpot or Dutch oven; add chicken stock. Place over medium heat. Combine Cheddar cheese with flour; stir mixture slowly into hot broth. Add Tabasco, dry mustard, and Worcestershire sauce. Bring to a simmer. Add beer; heat through and serve. Serves 4-6.