| Regimental number | 2892 |
| Place of birth | Bundaberg, Queensland |
| School | Bundaberg Central State School, Queensland |
| Religion | Presbyterian |
| Occupation | Engineer |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, K G Sinclair, Bourbon Street, Bundaberg, Queensland |
| Previous military service | Served in the Cadets. |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Private |
| Unit name | 9th Battalion, 9th Reinforcement |
| AWM Embarkation Roll number | 23/26/2 |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board HMAT A33 Ayrshire on |
| Rank from Nominal Roll | Private |
| Unit from Nominal Roll | 9th Battalion |
| Other details from Roll of Honour Circular | "One of the best shots in the battalion, was acting stretcher bearer and bringing in the wounded under heavy fire." [Father: J.A. Sinclair on Bundaberg, Queensland.] |
| Fate | Killed in Action |
| Place of death or wounding | Pozieres, Somme Sector, France |
| Age at death | 20 |
| Age at death from cemetery records | 19 |
| Place of burial | Pozieres British Cemetery (Plot III, Row K, Grave No. 28), Ovillers-La-Boisselle, France |
| Panel number, Roll of Honour, Australian War Memorial | 57 |
| Miscellaneous information from cemetery records | Parents: J. and Edith SINCLAIR, Grand Hotel, Bundaberg, Queensland |
| Family/military connections | Brother: John (Possibly John Francis Stuart) Sinclair, 28th Battalion, who was [frozen ?] at Flers on 5 November 1916 and so returned to Australia, where he died. |