Kellen Clemens is back. The Rams have agreed to terms on a one-year deal with the veteran quarterback. Clemens, 29, has been on the Rams’ roster for most of the 2012 season and part of 2011. He appeared in only two games last year, completing one of three passes for 39 yards. In 2011, the year Sam Bradford battled a high ankle injury, Clemens made three starts and completed 48 of 91 passes for 546 yards, two touchdowns and one interception. The added value with Clemens is that he’s very well-versed in the Rams’ offense, having played for offensive coordinator Brian Schottenheimer for five seasons when Schottenheimer was coordinator of the New York Jets.