Layer the carrots, parsnips, potatoes, celery, and onion wedges in the bottom of your slow cooker.
Season the roast with salt, pepper, garlic powder, and rosemary, then place it on top of the vegetables.
Mix beef broth and Worcestershire sauce together and pour over the roast and vegetables.
Cover and cook on low for 8-9 hours until the meat is tender and vegetables are soft.
Remove the roast and let it rest for 10 minutes before slicing.
Serve the sliced roast surrounded by the cooked vegetables with cooking liquid spooned over the top.