In a pot place all the veggies, onions, celery, potatoes - with just enough water to cover them all. Bring to a boil, slightly reduce heat.
Cover, and simmer about 15-20 minutes, until all the veggies are cooked. DO NOT DRAIN!
In a separate sauce pan, melt butter over medium-hi heat.
Whisk in flour, salt, sugar and pepper. Whisk and cook for 1 minute until mixture is bubbly.
Pour in milk. Whisk until it heats and thickens.
Add white sauce to the cooked veggies. Stir and heat over medium-hi heat.
Stir in clams and crumbled bacon. Season with more salt and pepper if desired.