| Regimental number | 1000 |
| Place of birth | Hobart, Tasmania |
| School | Trynithy Hill State School |
| Religion | Methodist |
| Occupation | Farm assistant |
| Address | Yorketown, South Australia |
| Marital status | Single |
| Age at embarkation | 18 |
| Height | 5' 7.5" |
| Weight | 137 lbs |
| Next of kin | Mother, Mrs Susan Marr, Yorketown, South Australia |
| Previous military service | Served for 1 year in the Senior Cadets prior to enlisting. |
| Enlistment date | |
| Place of enlistment | Keswick, South Australia |
| Rank on enlistment | Private |
| Unit name | 11th Light Horse Regiment, 4th Reinforcement |
| AWM Embarkation Roll number | 10/16/2 |
| Embarkation details | Unit embarked from Adelaide, South Australia, on board HMAT A15 Star Of England on |
| Rank from Nominal Roll | Gunner |
| Unit from Nominal Roll | 11th Field Artillery Brigade |
| Fate | Killed in Action |
| Place of death or wounding | France |
| Age at death | 20 |
| Age at death from cemetery records | 19 |
| Place of burial | Querrian British Cemetery (Row C, Grave No. 41), France |
| Panel number, Roll of Honour, Australian War Memorial | 17 |
| Miscellaneous information from cemetery records | Parents: John Thomas and Susan MARR, of 7 Lockner Street West, Hobart, Tasmania |
| Family/military connections | Brother: 5029 Pte John Thomas Henry MARR, 27th Bn, killed in action, 5 November 1916, on the Somme, France. |
| Other details |
War service: Egypt, Gallipoli, Western Front Medals: 1914-15 Star, British War Medal, Victory Medal |
| Sources | NAA: B2455, MARR Clifford Roy |