Crossword clues for the word: SPIFF The word SPIFF has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for SPIFF Showing 1 to 12 of 12 results Clue(s) ___ up (improve the look of) ___ up (make more stylish) ___ up (make stylish) ___ up (neaten) "Salesman's reward, slangily" Best-dressedness Calvin's alter ego Spaceman ___ Calvin's spaceman alter ego, in comics Salesman's reward Salesperson's incentive Spaceman ___ (Calvin's superhero alter ego in "Calvin & Hobbes") Spruce up