Clerc was left out of the French squad for the 2006 Autumn Internationals, but was called up as a replacement for Cédric Heymans for the match against Ireland during the 2007 Six Nations Championship.
In the 2006 Autumn Internationals, Clerc did not play in the French squad. However, he was later called up to replace Cédric Heymans for the match against Ireland in the 2007 Six Nations Championship.