[1][2] He also played Amateur Athletic Union (AAU) basketball for Joe Chatman[3] at Team Spartans in Dorchester, Massachusetts.

[3][4] Clingan averaged 27.3 points, 17.2 rebounds and 5.8 blocks per game as a junior and was named the Connecticut Gatorade Player of the Year.

[5] Clingan repeated as the Connecticut Gatorade Player of the Year after averaging 30.3 points, 18.4 rebounds and 6.2 blocks per game during his senior season.

[7] Clingan grew up with and is close friends with current UConn Huskies football running back Victor Rosa.

[15] Clingan returned on January 17, 2024, scoring six points and grabbing five rebounds in 16 minutes of play in a 62–48 win over 18th-ranked Creighton.