The term 'FISHERMAN's Hook' is a tool used by fishermen to help them catch fish. It consists of a sharp metal hook attached to a pole or line, which is used to snag and hold onto the fish. The crossword solution for this term is 'GAFF, ' which is a type of hook used in fishing. Gaffs are typically made of metal and have a long handle, allowing the FISHERMAN to reach out and grab the fish. They are often used in deep-sea fishing, as they can be used to haul large fish out of the water.