In a large skillet over medium heat, brown roast in oil on all sides. Place carrots, potatoes and onion in a 6-qt. slow cooker. Place roast on top of vegetables; sprinkle with steak seasoning. Add broth. Cook, covered, on low 10-12 hours, until beef and vegetables are tender. , Remove roast and vegetables from slow cooker; keep warm., Transfer cooking juices to a saucepan; skim fat. Bring juices to a boil. In a small bowl, mix cornstarch and water until smooth; stir into juices. Return to a boil, stirring constantly; cook and stir until thickened, 1-2 minutes. Serve with roast and vegetables.