The term 'MOTORIST'S GUN' is a crossword solution that consists of two words. The first word, 'MOTORIST', is defined as a person who drives a motor vehicle. The second word, 'GUN', is defined as a weapon typically designed to discharge bullets or other projectiles. Together, the two words form a phrase that describes a device used by motorists to signal for help in an emergency situation. This device is commonly known as a FLARE, which is a five-letter word that can be used to complete the crossword puzzle.