In business (which took up a lot of his time) he rose to the rank of general sales manager at Allied motors in Australia.

While studying at Sydney University, Clemenger played baseball, billiards, cricket and rugby, but it was at tennis he most excelled.

[2] Clemenger made his debut at the 1919 Australasian championships and lost in round three to James Anderson.

At the 1933 Australian championships, Clemenger lost in round two to Keith Gledhill.

At the 1935 Australian championships, Clemenger beat Jacques Brugnon before losing to Giorgio de Stefani in round three.