Answer: TOUGHNUTTOCRACK

AnswerCrossword Clue
TOUGHNUTTOCRACKDifficult task
TOUGHNUTTOCRACKPoser
TOUGHNUTTOCRACKBaffling problem
TOUGHNUTTOCRACKOne who's not easily convinced
TOUGHNUTTOCRACKBaffler
TOUGHNUTTOCRACKIt's pretty challenging
TOUGHNUTTOCRACKSquirrel's headache?
TOUGHNUTTOCRACKHard problem
TOUGHNUTTOCRACKDifficulty
TOUGHNUTTOCRACKHeck of a puzzle