Wipe out soup pot and place over moderate heat. Add bacon and cook, stirring occasionally, until crisp, about 12 minutes. Add onions, carrots, celery, 2 teaspoons salt, cayenne, and bay leaf. Cook until vegetables are soft, about 10 minutes. Stir in flour and cook until it begins to stick to the bottom of the pan, about 2 minutes. Stir in clam broth mixture and bring to a boil. Add potatoes, corn, and Old Bay and simmer over moderately low heat until potatoes are tender, about 15 minutes. Stir in half-and-half, parsley, Worcestershire sauce, and hot sauce. Remove from heat and stir in clams. Discard bay leaf and season chowder with salt and pepper. Ladle chowder into bowls and serve.