| Regimental number | 18241 |
| Place of birth | Unley, South Australia |
| Religion | Church of England |
| Occupation | Clerk and electrician |
| Address | North Unley, South Australia |
| Marital status | Single |
| Age at embarkation | 27 |
| Height | 5' 6.5" |
| Weight | 163 lbs |
| Next of kin | Father, J S Clark, Salisbury Street, North Unley, South Australia |
| Previous military service | Nil |
| Enlistment date | |
| Place of enlistment | Adelaide, South Australia |
| Rank on enlistment | Private |
| Unit name | June 1917 Reinforcements |
| AWM Embarkation Roll number | 26/99/2 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A15 Port Sydney on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 32nd Battalion |
| Fate | Returned to Australia |
| Miscellaneous details (Nominal Roll) | No details of fate entered on Nominal Roll. |
| Discharge date | |
| Other details |
War service: Western Front Commenced return to Australia on board HT 'Cap Verde', 5 January 1920; disembarked Adelaide, 22 February 1920; discharged (termination of period of enlistment), Adelaide, 24 March 1920. Medals: British War Medal, Victory Medal |
| Sources | NAA: B2455, CLARK William Clifford |