FLOWERY BRANCH — An Atlanta Falcons defense already having to adjust to losing its top cornerback for the season now also must compensate for the loss of one of its top pass rushers. Coach Dan Quinn said Wednesday defensive end Adrian Clayborn, who is second on the team with 4½ sacks, will miss at least two weeks after having surgery on his left knee. Clayborn suffered the injury in Sunday’s 38-19 win over Arizona.