Clarke signed a one-year deal with League One side Fleetwood Town after impressing manager Joey Barton with his attitude. He scored three goals in 17 appearances for the Fishermen, though did go over two months without a league start as Harry Souttar and Ashley Eastham had established themselves in a defensive back four. Tranmere Rovers On 1 January 2020, Clarke signed for Tranmere Rovers on an undisclosed-length contract, with manager Micky Mellon looking to add experience to the Rovers defence. Clarke said that "a realistic aim is to maintain our league status and finish in the middle of the table". However Tranmere were relegated on a points-per-game basis after the 2019–20 season was ended early due to the COVID-19 pandemic in England. Clarke remained at the club as he activated a one-year option in his contract. Rovers reached the final of the EFL Trophy at Wembley Stadium, where they were beaten 1–0 by Sunderland. He was an ever-present in the 2020–21 league campaign as Tranmere qualified for the League Two play-offs. He praised Keith Hill, who succeeded Mike Jackson as manager in October. However Hill was sacked just says before the play-offs were due to start, with Ian Dawes stepping in as caretaker. Clarke scored a headed goal in the play-offs, though Rovers would be beaten 3–2 on aggregate by Morecambe in the semi-finals. Clarke was named in the League Two Team of the Season at the EFL Awards and in the PFA Team of the Year after making 51 appearances in the 2021–22 campaign. He missed just two EFL Trophy games in the season despite being one of only five active players over the age of 40 in England's professional leagues, and Mellon credited this longevity to Clarke's openness to new ideas, his diet and his dedication to recovery. Walsall One 1 June 2022, Clarke signed a one-year contract with League Two side Walsall after turning down a new deal with Tranmere; he previously played with "Saddlers" boss Michael Flynn at Blackpool. He played sixteen games for the club. On 11 November 2022, he rejoined Oldham Athletic – now in the National League – on loan until 1 January. On 29 December, this loan was extended until the end of the season. International career Clarke represented his county at all youth levels having gained England under-21 honours, and captained England from Under-16 to Under-21 levels. He made his debut