Jackson was born in Kimberley, Nottinghamshire,[1] and played football for local clubs Kimberley St John's and Eastwood Rangers before joining Lincoln City.[2] He made his debut in January 1909,[1] and contributed to Lincoln becoming champions of the Midland League and consequent re-election to the Football League.[3] He played regularly from then on, making more than 30 appearances each season until the First World War put a stop to league football in 1915. He played 15 games in the first post-war season, his last appearances in Lincoln's first team.[1]
^ abcdefg"Clem Jackson". The Lincoln City FC Archive. Lincoln City F.C. Archived from the original on 3 March 2016. Retrieved 29 January 2013. Appearances per season are sourced via the Season Stats dropdown menu at the bottom right of this page. The site is partly subscription-based, but only free-access sections are used for reference. If pop-up login dialogue boxes appear, press the "Cancel" button to proceed.
^ abJoyce, Michael (2004). Football League Players' Records 1888 to 1939. Nottingham: SoccerData. p. 136. ISBN978-1-899468-67-6.
^"Lincoln City". Football Club History Database. Richard Rundle. Retrieved 29 January 2013.
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