Place potatoes, carrots, celery, onion into a large skilletPour in the reserved clam juice and enough water to cover. Cook and stir over medium heat until vegetables are tender. Meanwhile melt butter in a large heavy saucepan over medium heat. Whisk in the flour until smooth. Whisk in cream and stir constantly until thick and smooth.
Stir in the vegetable mixture with any juices until just heated through.
Stir in the clams just before serving. If they cook too much they get tough. When clams are heated through, stir in the vinegar and season with salt and pepper.