Crossword clues for What Jack should be 6 letters:NIKITAJack's Soviet counterpartONEEYEFeature of two jacksLYNDONJack's successorAVANTI1972 Billy Wilder comedy starring Jack LemmonSMILIN___ Jack (comic strip)JOHNNYHost between Jack and JayBIGSUR1963 Jack Kerouac novelAVANTIJack Lemmon comedy of 1972LEMMONJack of "Glengarry Glen Ross"LEMMONJack who played FelixNIMBLELike a nursery-rhyme JackONEEYEFeature of some jacksPIRATEJack Sparrow, for oneHORNERJack of children's rhymesNIMBLELike JackSLOANENCIS character Jack ___KNAVESJacks, in a deckMCKEONFlorida Marlins manager JackJUMPINLike Jack FlashCOSTASSportscaster whom Barry Bonds called "a little midget man who knows jack about baseball"ONEEYEFeature of a pair of jacksPACINOStar of "You Don't Know Jack"USOPENTournament won four times by Jack NicklausSTOLENJackedTHIEVEJackNBAFANDrake or Jack Nicholson, notablyMARISACostar of Adam and Jack in "Anger Management"MAULERJack Dempsey, aka the "Manassa ___"LINEINCertain audio device jackDORSEYTwitter founder JackSPRANGEmerged like a clown from a jack-in-the-boxKNAVESJacksSMILIN___ Jack (old comic strip)EUCHREIts highest card is jack of trumpsTINMANJack Haley's "Oz" roleHORNERJack in a nursery rhymeARETHA1986 album with the hit "Jumpin' Jack Flash"TINEARJack Haley's musical impediment?RIPPERJack's sensational sobriquetAFLCIOUnion jack collector?: Abbr.USOPENJack Nicklaus won it four timesKNAVESCard jacks?SMILIN___ Jack (Zack Mosley comic strip)LISTERDiarist Anne portrayed in "Gentleman Jack"KNAVESJacks in decksAVANTI1972 Jack Lemmon comedyHORNERPlum-thumbed JackAVANTI1972 Jack Lemmon flickSHEASSJack's mate on the farmBORDENCompany that owned the Cracker Jack brand before Frito-Lay