Rams quarterback Sam Bradford will be sidelined for the fourth time this season because of a nagging ankle sprain. Kellen Clemens will start for St. Louis against Cincinnati, according to a league source. Clemens was signed off waivers from the Texans two weeks ago as A.J. Feeley remained sidelined with a fractured right thumb. "I feel prepared," Clemens said last week. "It's a short week, which doesn't help, but I'm going to get three practices this week instead of two so I think by Sunday afternoon I should be ready to go."