Clever was the fourth-youngest Eagles player to be capped at 20 years old August 23, 2003, against Argentina in the Pan-American Championship. The Eagles’ captain has appeared in both the 2007 and 2011 Rugby World Cups. Clever has played for the Lions in Super Rugby, Old Mission Beach Athletic Club, Japan’s Suntory Sungoliath and NTT Shining Arcs, and the English Premiership's Newcastle Falcons. He became the first American to play and score a try in the then-Super 14 for the Lions. Clever also made 24 tournament appearances for the Men’s Eagles Sevens from 2004-2009 and was a three-time Collegiate All-American at the University of Nevada, Reno.
He broke the record for most international test appearances by an American with his 68th cap against Russia in the summer of 2016.