Hard nut to crack

This time we are looking on the crossword clue for: Hard nut to crack.
it’s A 17 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: PECAN, ENIGMA, POSER.

Last seen on: –USA Today Crossword – Apr 8 2021
NY Times Crossword 3 Dec 20, Thursday
Universal Crossword – Jul 25 2020