The 24-year-old Guilford, who can also play at fullback, was part of the 2011 World Cup winning squad, notably scoring four tries against Canada.

Clermont, the 2013 Heineken Cup runners-up, lead the standings in the Top 14, which they won for the first time in 2010 after 10 failed attempts in the final.

Top 14
France scrum-half Tillous-Borde extends Toulon deal
14/02/2015 AT 11:54

Guilford, who has an option for an extra year on his contract, is the latest addition to a series of top-notch recruits for Clermont after France lock Sebastien Vahaamahina and Wales and British & Irish Lions centre Jonathan Davies.

Top 14
All Black Conrad Smith moving to France after World Cup
06/02/2015 AT 01:56
Top 14
Wilkinson signs off in style with Toulon win
31/05/2014 AT 21:09