Add the cubed venison roast to a large bowl and mix with the flour, salt and pepper. Coat the venison well.
In a large skillet add the vegetable oil and heat over medium-high heat.
Add the venison roast cubes to the skillet and brown on all sides.
Add the browned venison to the slow cooker, along with the diced onion, celery, carrots, potatoes, garlic, thyme, seasoning, Worcestershire sauce and tomato paste. Pour over the beef broth and cover.