 He was given a free transfer in June 1999, and joined Third Division club Peterborough United.He rediscovered his scoring form at London Road under Barry Fry, his former manager at Barnet, bagging 18 goals in 43 appearances in 1999–2000.The "Posh" finished fifth, and Clarke scored at Underhill in a 5–1 win over Barnet in the play-off semi-finals.