Martin's career began with the Boston Bruins in 1941–42 NHL season. After that season he enlisted in the Canadian military for World War II. He made it back to the NHL with the Bruins in 1947. He got his first taste on playoff experience that season. He played one more season with the Bruins in 1948. In 1949 he played for the Hershey Bears of the AHL.
Clare Martin was traded to the Detroit Red Wings in the summer of 1949 along with Pete Babando, Lloyd Doran and Jimmy Peters for Pete Horeck and Bill Quackenbush. He helped the Red Wings win the 1950 Stanley Cup. He played the 1951 season for the Red Wings before being traded to the Chicago Black Hawks with George Gee, Jim McFadden, Max McNab, Jimmy Peters and Clare Raglan in what amounted to an opportunity to shore up a Chicago franchise that was on the decline. He played only 31 games for the Black Hawks before he was traded to the New York Rangers at Christmas 1951. He played only 14 games for the Blueshirts. He finished the 1952 season with the Cincinnati Mohawks of the AHL. He played 3 seasons of Senior hockey with the Kitchener Dutchmen helping them win the 1953 Allan Cup before retiring from hockey.
- Height 5' 11".
- Weight 180 Lbs.
- Wore Uniform #19 and 21 for the Boston Bruins.
- Wore Uniform # 6 for the Chicago Black Hawks.
- Wore Uniform # 17 for the New York Rangers.