Crossword clues for What 21 Across is known for 4 lettersAnswerClueBEERWhat 21 Across is known forJACKSONWith 21-Across, artist known to 39-Across pigments back and forth onto canvasesGIANTN.Y. or S.F. athlete known for the beginnings of 21-, 31-, 42-, and 54-Across?