Career
He was the principal secretary to the Rhodesian Cabinet (under Prime Minister Ian Smith) throughout the existence of the Rhodesian Front Government (1964–1979). A close confidant of Prime Minister Smith, Clarke attended virtually every conference and Heads-of-Governments meetings that Smith attended throughout his tenure. Clarke organised and ran the sub-committee that drew up the Unilateral Declaration of Independence, which Smith and his Cabinet signed on 11 November 1965.
