Christian Wilkins is returning to Clemson, which brings back its entire defensive line Posted Jan 17, 2018 Clemson's defensive front four was arguably the best in college football this past season. It should once again be in that conversation again in 2018. On Monday, Clemson announced that stud defensive tackle Christian Wilkins was returning for his senior season. The deadline for undergraduate declarations for the upcoming NFL Draft was Monday at 5 p.m. ET. (CBS Sports)