The term 'magic bullet' is a metaphor for a solution that can quickly and easily solve a difficult problem. In this case, the crossword solution for the term 'magic bullet' is 'CURE', which is a four-letter word. A CURE is a remedy or treatment that can quickly and effectively eliminate a disease or ailment. The term 'magic bullet' is often used to describe a CURE that is so effective that it can quickly and easily solve a difficult problem.