Don Sackcloth and Ashes is a phrase used to describe a form of repentance. It is derived from the Bible, where it is used to describe a sign of sorrow and regret for one's sins. The phrase is often used to refer to an act of contrition or penitence. In the crossword, the solution for the term Don Sackcloth and Ashes is 'REPENT, ' which is a verb meaning to feel sorry for one's sins and turn away from them.