Vancouver selected Clement 31st overall in the 2013 Major League Soccer supplemental draft.
The 22-year-old spent the latter part of pre-season with the Whitecaps and made four starts, including matches against Arizona Sahuaros, College of Charleston, Houston Dynamo and Carolina RailHawks.
Clement played four seasons of NCAA Division I soccer with the Duquesne University Dukes, where the six-foot-four, 195-pound defender registered four goals and six assists in 71 matches.
The Erie, Pa., native received the Atlantic 10 all-conference first team honours for his efforts during his final two seasons with the Dukes, which included three goals and four assists in his senior year.
"Adam impressed us a lot with his quality during the pre-season and we believe he has all the tools to become an important contributor within our club," Whitecaps head coach Martin Rennie said in a statement.