The crossword solution for the term 'DON'T PLAY FAIR' is 'CHEAT' which is a five letter word. Cheating is an act of dishonesty or unfairness in order to gain an advantage over others. It is often used in sports, games, and other competitive activities. Cheating can also be used in academic settings, such as plagiarism or copying someone else's work. Cheating is considered unethical and can have serious consequences.