Clemens, in his sixth season, was signed by the Redskins on July 29. He spent the last five years with the Jets, primarily as a backup, and threw for 1,686 yards and five touchdowns against 11 interceptions in 25 games.
Hicks started 10 games at right guard for the Redskins last season. The 32- year-old Memphis product has appeared in 109 games -- 68 starts -- over nine seasons with the Eagles, Vikings and Redskins.
Horton was a seventh-round pick by Washington in the 2008 NFL draft. He started seven games last season, compiling nine tackles. In his three seasons with the Redskins, he has tallied 122 tackles and three interceptions.
Additionally, the Redskins cut Isaac Anderson, Horatio Blades, Anthony Bryant, Selvish Capers, Tony Curtis, Shaun Draughn, Thaddeus Gibson, Matt Gutierrez, Maurice Hurt, Edgar Jones, Reggie Jones, Clint Olenburg, Donovan Raiola, Aldrick Robinson, Evan Royster, Anderson Russell, Derek Schouman, Davonte Shannon, Jeff Stehle, Doug Worthington and Keiland Williams.