William Clark was the son of George and Margaret Clark. William was born about 1897. William enlisted in Glasgow where he lived. Private William Clark was serving with the 2nd Battalion of the Royal Scots when he was killed in action on 26th September 1917. He was 20 years old. Private William Clark is also commemorated on the Roll of Honour in 1st Portglenone Presbyterian Church. The CWGC record Private William Clark as the son of George and Margaret Clark, of Garvaghy, Portglenone, Co. Antrim..
The Tyne Cot Memorial to the Missing forms the north-eastern boundary of Tyne Cot Cemetery, which is located 9 kilometres north east of Ieper town centre, on the Tynecotstraat, a road leading from the Zonnebeekseweg (N332). The names of those from United Kingdom units are inscribed on Panels arranged by Regiment under their respective Ranks. The names of those from New Zealand units are inscribed on panels within the New Zealand Memorial Apse located at the centre of the Memorial.
