 On April 2, 2013, he was traded from Washington to the Phoenix Coyotes in return of Joel Rechlicz.During the 2011-12 pre-season, Clackson was illegally hit from behind by Calgary Flames forward Pierre-Luc Letourneau-Leblond.In handing down a five-game suspension against Letourneau-Leblond, Brendan Shanahan, the new head of NHL discipline, posted on the NHL website video of the hit on Clackson to illustrate his ruling - the first of what would become Shanahan's trademark video explanations.