The crossword solution for the term 'NESS ADVERSARY' is Capone, a six-letter word. Capone was an American gangster who became a symbol of the criminal underworld during the Prohibition era in the United States. He was the leader of the Chicago Outfit and was notorious for his involvement in organized crime. He was also known for his rivalry with law enforcement agent Eliot Ness, which led to his eventual arrest and conviction.