I've been hyping Clark for a while. As just a talent, he's a 1st RD guy, and I'd take him 10 out of 10 times over Dante Fowler. Lance Zierlein recently said that Clark is being talked about as a top-100 pick, so he's not completely off teams boards. If a team believes in his character, it's just a matter of how late they think they can get him. He'd be a rare find in the 2nd round. High-level athlete with great size and length (longer arms and bigger hands than Gregory), and he was much more productive than most people think.
http://www.nfl.com/draft/2015/profiles/frank-clark?id=2552629
https://www.profootballfocus.com/blog/2015/04/07/cff-sig-stats-edge-defenders/
If he stays healthy and out of trouble, he should be the best Edge player drafted outside the 1st RD.
I also like Shaq Riddick, Preston Smith (could be there at 47), Danielle Hunter, Marcus Rush, and Trey Flowers after the 1st. Rush would be a SLB. Riddick could probably go DE or SLB, but Clark, Smith, Hunter, and Flowers could all play 4-3 DE.