| Date of birth | |
| Religion | Church of England |
| Occupation | Barrister And Solicitor |
| Address | 'Youngera', Yarra Street, Hawthorn, Victoria |
| Marital status | Married |
| Age at embarkation | 38 |
| Height | 5' 7" |
| Weight | 159 lbs |
| Next of kin | Mrs St John Clarke, 'Youngera', Yarra Street, Hawthorn, Victoria |
| Enlistment date | |
| Rank on enlistment | Major |
| Unit name | 4th Light Horse Regiment, A Squadron |
| AWM Embarkation Roll number | 10/9/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board Transport A18 Wiltshire on |
| Rank from Nominal Roll | Major |
| Unit from Nominal Roll | 4th Light Horse Regiment |
| Fate | Returned to Australia |
| Discharge date | |
| Other details |
War service: Egypt, Gallipoli, Palestine Medals: 1914-15 Star, British War Medal, Victory Medal |
| Miscellaneous details | Served in South Africa (Boer War). |
| Date of death | |
| Age at death | 89 |
| Sources | NAA: B2455, CLARKE CYRIL WILBERFORCE ST JOHN |