The term 'The Iceman' refers to Ötzi, a 5, 300-year-old mummy discovered in the Ötztal Alps in 1991. He is believed to have been a hunter-gatherer and his nickname comes from the fact that he was found frozen in a glacier. The crossword solution for this term is 'cometh', which is an archaic form of the verb 'COME'. This verb is used to describe the arrival of someone or something, and in this case it is referring to the discovery of Ötzi in the Alps.