Brown bacon in dutch oven, remove. Drain juice from clams into the dutch oven, add onions, celery, potatoes and carrots, cook over medium heat until tender. Meanwhile, in saucepan, melt the butter over medium heat. Whisk in flour until smooth. Whisk in cream and stir constantly until thick and smooth. Stir into veggies and clam juice. Heat through but do not boil. Stir in clams just before serving, if they cook too much they get tough. When clams are heated through, stir in vinegar and season with salt and pepper