Cliff Green grew up in the outer Melbourne suburbs of Sunshine and Upwey. After leaving Upwey High School at 14, he worked as an office boy and later undertook an apprenticeship as a compositor in the printing trade. He later returned to study at night and graduated from Toorak Teachers College, after which he taught for nine years in small Victorian country schools. Thoughout this time, Green wrote short stories and television scripts and in 1969 turned to screenwriting as a full-time profession..
Green first worked for Crawford Productions contributing regular episodes to their popular television police dramas Homicide (1969-70) and Matlock Police (1971-72), as well as writing telemovies such as Halfway to Nowhere (1972) and The Spoiler (1972). He later worked for the Australian Broadcasting Corporation writing for documentaries and series, and was engaged as a tutor in film and television writing for the Victorian Council of Adult Education. Among the extensive list of television series for which he wrote are Rush (1974), The Seven Ages of Man (1975), Power Without Glory (1976), Against the Wind (1978), Lucinda Brayford (1980), A County Practice (1984), Special Squad (1984-85), The Petrov Affair (1987), Mission Impossible (1988), The Flying Doctors (1988-90), Phoenix (1992), Janus (1994), Mercury (1996), Something in the Air (2000), and Marshall Law (2002).
In addition to television drama series, Green wrote a number of feature film and telemovie screenplays, including Picnic at Hanging Rock (1975), Let the Balloon Go (1976, additional dialogue), Summerfield (1977), Mystery Island (1980), I Can Jump Puddles (1981), and The Incredible Steam-Driven Adventures of Riverboat Bill (1986). Green's film and television writing achievements were recognised through professional awards for excellence, including numerous Australian Writers' Guild Awards (AWGIEs) between 1974 and 1992 for television plays and film adaptations.
Among Green's other works are Upbeat (1956), an anthology of folk songs edited by Green; The Art of Dale Marsh (1981); and Evergreen: The Story of a Family (1984). He was also the author of many humorous and popular children's books.