The term 'CERTAIN LONGHORN' can be solved by the crossword solution STEER, which is a five-letter word. A STEER is a castrated male bovine, typically a bull or ox, that is used for draft work or for meat. In the United States, the term 'LONGHORN' is often used to refer to a breed of cattle that originated in Texas and is known for its long horns. Therefore, the term 'CERTAIN LONGHORN' could refer to a specific breed of STEER with long horns.