Slow Cooker Pot Roast

Name: Slow Cooker Pot Roast
Ingredients: One 4-pound beef chuck roast; Kosher salt and freshly ground black pepper; 1/3 cup all-purpose flour, plus more for coating; 3 tablespoons olive oil; 4 medium carrots, cut into 2-inch pieces; 3 stalks celery, peeled and cut into 2-inch pieces; 1 medium onion, cut into 1/2-inch wedges; 3 cloves garlic, mashed; 3 tablespoons tomato paste; 1 cup red wine; 3 cups low-sodium beef broth; 3 bay leaves; 2 sprigs fresh thyme; 1/2 teaspoon ground allspice; 1/2 cup loosely packed parsley leaves, chopped