1. Add vegetables to slow cooker insert. Season beef on all sides with salt and pepper; place on top of vegetables. Combine sauce and broth; pour over meat. Cover with lid.
2. Cook on LOW 8 hours (or on HIGH 4 hours) or until meat is fork-tender. During last 15 min. of cooking, remove meat from sauce. Skim sauce of excess fat; whisk in flour. Carefully cut meat or coarsely shred in large chunks and return to sauce to continue cooking. Gently toss meat mixture with hot cooked pasta and parsley.