2017 - In week 13 of 2017, Clark recorded 1.5 sacks, his first of his NFL career and 6 combined tackles in a 26-20 OT win over the Tampa Bay Buccaneers. He would finish the season with 4.5 sacks and 55 tackles.
2016 - Clark made his professional debut in the Packers' season opener against the Jacksonville Jaguars and made one assisted tackle in the 23–27 victory. On September 25, 2016, he made his first career start against the Detroit Lions and racked up a total of four tackles in the Packer's win. In Week 14, Clark made four combined tackles during a 38–10 victory against the Seattle Seahawks. As a rookie in 2016, Clark finished with 21 tackles and two passes defended in 16 games.
2015 - Already established as a strong run defender, he improved as a pass rusher as a junior after entering with just one career sack. He had a career-high three sacks against Washington State. He was named third-team All-American by the Associated Press and was the lone Bruin named first-team All-Pac-12. Clark had a career-high 11 tackles in the Foster Farms Bowl against Nebraska, and ranked second on the team with 75 tackles and six sacks. After the season ended he decided to forgo his senior year and enter the 2016 NFL draft.
2014 - As a sophomore in , Clark was a second-team All-Pac-12 after starting all 13 games and making 58 tackles.
2013 - Clark appeared in all 13 games as a true freshman at UCLA. He started four games and had 31 tackles.
Clark attended Wilmer Amina Carter High School in Rialto, California. As a senior, he had 71 tackles and 11 sacks. He was rated by Rivals.com as a four-star recruit and committed to the University of California, Los Angeles (UCLA) to play College football. Clark also wrestled in high school.