"We had been in contact with Scott for several seasons. We are very happy to see such a talented and consistent player join the club for the seasons to come," said Clermont sports director Jean-Marc Lhermet of the 28-year-old South African-born player.
Spedding was called up by France for the first time in November and started against Fiji, Australia and Argentina.
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His contract with Clermont includes an option for an additional season at the Auvergne club.
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