Crossword clues for the word: USAC The word USAC has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for USAC Showing 1 to 5 of 5 results Clue(s) Car-racing org. Midget car-racing org. Pre-ROTC group Sprint car racing org. U.S. auto clb.