[4] Such was his early promise that Leicester City paid £150,000 for Clarke in 1968, a then British football transfer fee record.

[7] Clarke spent just one season at Leicester City, in which he scored the winning goal in the semi-final of the 1969 FA Cup, knocking out the team he had supported as a boy – West Bromwich Albion.

[8] On 24 June 1969, Leeds United manager Don Revie paid £165,000 to Leicester City for Clarke's services.

[9] Clarke was in the Leeds United side that won its second Fairs Cup in 1971,[9] scoring in the final against Juventus.

[5] Clarke scored the only goal of the game with a diving header from a Jones cross early in the second half.

[5] Clarke played again at Wembley – and lost – when Leeds United were beaten 1–0 by Sunderland in the 1973 FA Cup Final.

[9] He remains the most recent England player to make his international debut in a World Cup finals match.

[13][14] Clarke then began to bring in new players such as Trevor Aylott and Derrick Parker and Ian Evans and Barnsley finished mid-table.

[12] Despite having no money to spend, low gates, and being forced to sell players such as David Hirst and John Beresford,[5] Clarke led Barnsley to the fifth round of the FA Cup twice, when they were knocked out by Arsenal in 1987 and Everton in 1989.

[5] At the end of 1988–89 season, Barnsley finished just two points off securing a play-off place, losing only twice in the last 17 games.

[12] From 1993 until he reached retirement age,[15] Clarke was a travelling salesman for MTS Nationwide, a firm based at Wakefield, West Yorkshire.