Crossword clues for Spiffs up:SPIFFNeaten, with "up"SPIFFCalvin's spaceman alter ego, in comicsSPIFFNeaten (up)SPIFF__ up (improve the look of)SPIFFAdorn, with "up"SPIFFSpruce (up)SPIFFBest-dressednessSPIFFCalvin's alter ego Spaceman ___SPIFF__ up (neaten)SPIFFSWith "up," makes snappy-lookingSPIFFEquivalent of spruceSPIFF___ up (improve the look of)SPIFFSalesman's reward, slangilySPIFFSalesman's rewardSPIFF__ up (make stylish)SPIFFSSpruces (up)SPIFFSmarten (up)SPIFFSGussies (up)SPIFF___ up (make more stylish)SPIFF___ up (make stylish)SPIFFSplendid: Slang.NICENSpiff (up), in dialectPOLISHSpiff upALTEREGOSSpaceman Spiff and Stupendous Man, for Calvin in "Calvin and Hobbes"SNAZZSpiff (up)TOGSSpiffs (up)REDOSpiff up, in a wayRESODSpiff up, as a fairwayREDOSpiff up the decor ofREDOSpiff up, as decorIRONSpiff up the shirtsRETILESpiff up the floors ofWAXESSpiffs up one's mustacheSMARTENSpiff (up)SPACEMAN___ Spiff (Calvin's alter ego)SHINESSpiffs up the wingtipsWAXESSpiffs up the JagSPRUCESpiff (up)NEATENSSpiffs upNEATENSpiff upGUSSYSpiff (up)JAZZESSpiffs (up)ARRANGEROVERSpiff up the family dog?DETAILEROne who spiffs up your wheelsHOTDATEOccasion to spiff upPOLISHSHOESSpiff up footwearREDOSpiff upPRIMSSpiffs upREDOSpiff up, perhapsSTAGESpiff up, as realty