On 27 March 1907 he was selected to visit Japan, the United States, Canada and the United Kingdom in order to study Naval dockyards, ship construction and training methods.[4] In this period he oversaw the building of destroyers for the CNF, which would become the first ships of the newly founded Royal Australian Navy.[2]
He was promoted to Rear Admiral on 1 April 1916. At the outbreak of World War I he became the Director of Transports and Controller of Shipping. By 1918 he was regarded as "without peer in Australian maritime affairs".[2] Upon the formation of the Inter-State Central Committee he became Chairman and Controller of coastal shipping.[6] For his duties in this capacity, in 1919 he was made a Knight Commander of the Order of the British Empire. The citation reads
Rear-Admiral William Clarkson, CMG, RAN, for services in connection with the control and reorganisation of coastal shipping.[7]
He was promoted to vice admiral on 1 November 1922 and transferred to the retired list.[2]
He died of heart disease at the family home in Darling Point, Sydney, Australia on 21 Jan 1934. He was cremated at the Rookwood Crematorium
[8] and a funeral with full military honours was held. His ashes were then transported back to his hometown, where they were interred in the family memorial at the Church of Saint Mary, Whitby.[1]
^"South Australia - Defence of the Colony". The Manning Index of South Australian History. State Library of South Australia. 1 September 1936. Retrieved 28 September 2014.
^House of Representatives (29 October 1920). "Select Committee on Australian Overseas and Inter-State Sea Carriage". Final Report (Dated 29th October, 1920), together with Minutes of Proceedings of the Committee. The Parliament of the Commonwealth of Australia. Retrieved 28 September 2014.