As of 2023, he is centre back and captain of Fossa, half forward for regional side East Kerry and at senior level for the Kerry county team.
He is also a two-time winner of the Kerry Senior Football Championship with East Kerry GAA As a member of the Kerry junior team, Clifford won the 2018 All-Ireland Junior Football Championship and Munster Junior Football Championship.
On 24 July, Kerry won the 2022 All-Ireland Senior Football Championship Final, giving the county their 38th title and Clifford his first.
With UCC GAA, he was part of the college's 2019 Sigerson Cup winning side.
This biographical article relating to Republic of Ireland association football is a stub.