The term 'BRUCE OF 'ENTER THE DRAGON'' refers to the late martial artist and actor Bruce LEE, who starred in the 1973 martial arts film 'Enter the Dragon'. His surname, LEE, is a three-letter word that can be used to solve the crossword. Bruce LEE was an iconic figure in the martial arts world, having popularized the martial art of Jeet Kune Do. He was also a successful actor, appearing in numerous films and television shows. His most famous role was in 'Enter the Dragon', which is widely considered to be one of the greatest martial arts films of all time.