The term 'Deck Topper' is a job title for someone who is responsible for the maintenance and upkeep of the top deck of a ship. The crossword solution for this term is 'ACE', which stands for 'Able-bodied Seaman'. An Able-bodied Seaman is a sailor who is qualified to perform all duties related to the operation and navigation of a ship. They are also responsible for the maintenance and upkeep of the top deck of a ship, making them a Deck Topper.