The term 'CERTAIN CHOPPER' can be solved by the crossword solution 'HARLEY', which is a 6-letter word. Harley-Davidson is an American motorcycle manufacturer founded in 1903. It is one of the most iconic brands in the world and is known for its chopper-style motorcycles. The term 'CERTAIN CHOPPER' is often used to refer to a Harley-Davidson chopper, as it is one of the most recognizable and popular choppers on the market.