Answer: blackening

AnswerCrossword Clue
blackeningBLACKEN, to defame (to destroy the reputation of)
blackening(of the sky) Become dark as night or a storm approaches
blackeningDye or color (the face or hair) black for camouflage or cosmetic effect
blackeningDamage or destroy (someone's good reputation); defame
blackeningBecome or make black or dark, esp. as a result of burning, decay, or bruising