Drain juice from clams into a large skillet over the onions, celery, potatoes and carrots. Add water to cover, and cook over medium heat until tender.
2
Meanwhile, in a large, heavy saucepan, melt the butter over medium heat. Whisk in flour until smooth. Whisk in cream and stir constantly until thick and smooth.
3
Stir in vegetables and clam juice. Heat through, but do not boil.
4
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.