The 27-year-old had seen limited time on the field as a member of the Baltimore Ravens and Arizona Cardinals.
The "seven-figure commitment" provided by West Shore Home and MITER Brands will span over two years.
Clifford threw for 10,661 yards and 86 touchdowns during his Penn State career, and his experience may propel him to a late-round NFL Draft selection.
"He's been invaluable for us."
The annual Blue-White Game is back along with many fan experiences, including the Blue-White Boardwalk.
"Leadership is not always the loudest guy. It's the guy that shows up every day and is consistent and makes people around him better."