*Club domestic league appearances and goals, correct as of 21:09, 19 May 2024 (UTC) ‡ National team caps and goals, correct as of 10:44, 30 March 2022 (UTC)
Clarkson made his professional debut for Liverpool on 17 December 2019, coming on as a substitute in the away match against Aston Villa in the quarter-finals of the EFL Cup.[5]
On 4 February 2020, he played in the FA Cup 4th Round replay against Shrewsbury Town, winning 1–0 in the youngest-ever Liverpool side in history.[6]
On 24 July 2020, Clarkson signed a long-term contract with Liverpool.[7]
On 9 December 2020, he was named in the starting eleven for a Champions League group stage game against Danish side FC Midtjylland.[8]
On 16 August 2021, it was announced that Clarkson would join hometown club Blackburn Rovers on a season-long loan deal.[9] His loan was cut short in January 2022.[10]
Scored on his Aberdeen debut in a 4-1 win over St Mirren.The 21-year-old has scored five goals and provided eight assists across all competitions this season.[11]
On 15 June 2023, Aberdeen FC announced that Clarkson would join them on a four-year deal for an undisclosed fee.[12]
On 12 May 2024 he scored in the 4-0 win for Aberdeen.[13]