Crossword clues for Sine qua nons:NEEDSine qua nonHUMOR. . . and his sine qua nonWITArt Buchwald's sine qua nonGLAMDrag queen's sine qua nonCAUSA___ sine qua nonENDALLSine qua nonNEEDEDLike a sine qua nonWAVESurfing sine qua nonNECESSITYSine qua nonAMMOBattle sine qua nonESSENTIALSine qua nonPRESSESSine qua non, for newspapers.SUPPORTCongressman's sine qua non.PETROLEUMSine qua non for the wheels of industry.TABLEWARERestaurant sine qua non.TRAPEZESine qua non for an aerialist.TEXTBOOKStudent's sine qua non.INDEXSine qua non for a textbook.CHARTNavigator's sine qua nonFOURHANDSSine qua non for certain duetsAGILITYSine qua non of pedestrians, subwayites, etc.MUSTSine qua nonCHEESEWelsh-rabbit sine qua nonSTEALTHThief's sine qua nonBALANCEFunambulist's sine qua nonBODYWhodunit sine qua nonCARSuburbanite's sine qua nonPADDLESine qua non when up the creekSTEALTHCat burglar's sine qua nonVIGORSine qua non for an athletePATIENTSDoctors' sine qua nonSTAMINAMiler's sine qua nonTEAPOTSine qua non at an afternoon affairOVENPizzeria sine qua nonOVENPizzeria's sine qua nonLOANERBorrower's sine qua nonCAMERASine qua non for 7 AcrossAIRThe world's sine qua nonROOFShelter sine qua nonROTORHelicopter's sine qua nonALERTNESSSentry's sine qua nonKEYSTONEArch's sine qua nonADSTV networks' sine qua nonTASTEDecorator's sine qua nonEARMusician's sine qua nonNEEDSSine qua nonsRINGWedding sine qua nonEGGSSoufflé sine qua nonCAUSA____ sine qua non (requisite)SUCTIONVacuum-cleaner sine qua non