The term 'Boston Players, Briefly' is referring to the National Basketball Association (NBA) team, the Boston Celtics. The crossword solution for this term is 'CELTS, ' which is a five-letter word. The Boston Celtics are one of the most successful teams in NBA history, having won 17 championships since their founding in 1946. They are also one of the oldest teams in the league, and have been playing in the same city since their inception.