Mix first 6 ingredients. Place turkey, breast side up, on roasting rack in shallow roasting pan. Sprinkle 1 tbsp of the spice mixture inside the turkey. Stuff with celery, onion, orange, and bay leaves. Brush turkey lightly with oil. Spread remaining spice mixture over entire surface and under skin of turkey. Add stock to pan and cover loosely with heavy-duty foil.

Roast in preheated 325•F oven for 1 hour. Remove foil. Roast 2 to 2 1/2 hours longer or until internal temperature reaches 165•F (175•F in thigh), basting occasionally with pan juices. Remove turkey from oven. Let stand 20 minutes. Transfer to serving platter. Reserve pan juices to make gravy or serve with turkey.