Bills tight end Charles Clay didn’t practice Wednesday because of his knee injury, coach Sean McDermott said. He was initially expected to be limited.In Sunday’s loss to New England, Clay played 44 snaps, or 66 percent, about the same as the previous week, but he got just three targets. His usage since his return from a torn meniscus has been nowhere near what it was early in the season, when he got six or more targets in three of the first four games. If the injury is bothering him again, that puts a further damper on an outlook that is already handicapped by Buffalo’s dysfunctional passing game. Fantasy owners would not be blamed if they dropped him.