The crossword solution for the term 'CERTAIN PUGILIST, FOR SHORT' is WELTER, which is a six-letter word. A welterweight is a weight class in boxing, and is typically between 147 and 154 pounds. It is also sometimes referred to as a junior middleweight. The term 'WELTER' is derived from the Middle English word 'welteren, ' which means 'to roll about.' Thus, the term 'CERTAIN PUGILIST, FOR SHORT' can be answered with the word 'WELTER, ' which is a reference to a boxer in the welterweight class.