The answer to the crossword for the term 'WHAT TO CALL A KETCH' is 'HER', which is an acronym for 'Heading, Engine, and Rudder'. This acronym is used to refer to the three main components of a ketch, which is a type of sailing vessel. A ketch typically has two masts, with the main mast being taller than the mizzen mast. The heading refers to the direction the boat is facing, the engine is the motor that propels the boat, and the rudder is the steering mechanism.