Hinkley was a pupil at
St Peter's High School, Gloucester,
Bromsgrove School, and
Hartpury University. He joined the Gloucester academy in the summer of 2017. He made his debut as a replacement for
Ben Morgan in an
Anglo-Welsh Cup game against
Newcastle Falcons on 3 February 2018 and had a try disallowed for having a foot in touch. He made his
Premiership debut, again as a replacement for Ben Morgan, against
Exeter Chiefs on 24 November 2018. He was nominated for the 2019/20
Premiership Rugby Cup breakthrough player award after scoring a try against
London Irish in the group stage. It was announced on 2 March 2020 that Hinkley will be joining
Exeter Chiefs for the 2020/21 season. On 31 May 2022, it was confirmed that Hinkley signed for Premiership rivals
Northampton Saints following a successful trial from the 2022–23 season. On 23 March 2023 he was released from his Saints' contract. ==International career==