n TV world, it's déclassé for any show to be called a "spin-off." Sounds like a throwaway, of sorts. Not too many TV executives will cop to this usable, but much maligned, TV term. They might use other snooty terms - "product extension" or "line extension." Still, ABC's "Private Practice" seems to be doing nicely -- as a spin-whatever show, about a character that used to be on "Grey's Anatomy."