1) American mystery novel 2) Jokes that create rifts 3) Opens up a walnut shell 4) Quips 5) Sarcastic remarks 6) Some are wise 7) Spackle targets 8) They may be wise 9) Unlicensed software copies 10) Wise remarks 11) Witty remarks 12) Words from the wise 13) Yields to pressure Found on https://www.crosswordclues.com/clue/cracks