Poppy plays at Saracens alongside twin sister, Bryony and made her England debut in the 2016 Six Nations. She started playing rugby at six and played for Bristol between 2010-12 and during the 2016-17 season, with Saracens being her home in between times - a club she re-joined for the 2017-18 Tyrrells Premier 15s. Poppy featured in every match in the 2017 Grand Slam winning side and was a late call-up at the Women's Rugby World Cup that year. In 2018, Cleall started all five games in the Six Nations as she switched her time between flanker, No 8 and second row. She featured in all five of the 2019 Women’s Six Nations tests and was also part of the Saracens side to seal back-to-back league titles. Poppy earned a professional contract for 2019/20 and scored a hat-trick in England's 66-7 win over Wales in the 2020 Six Nations and was part of the Red Roses squad that reached the final of the delayed 2021 Rugby World Cup. She was recently named in John Mitchell’s squad for the Guinness Women’s Six Nations 2024.