During his refereeing career Clancy has been involved in several controversies and incidents. On his Six Nations Championship debut on 14 February 2009, Clancy awarded a try to France's Fulgence Ouedraogo against Scotland. Replays showed the final pass from Maxime Médard was forward. However, Clancy had been knocked to the ground in the move building up to the score. He consulted with his assistant before confirming the try.