Seems intriguing - definitely draftable. I haven't watched any Clemson, but his stats have improved a lot this year. Draftexpress did a writup on him at the beginning of the season:
http://www.draftexpress.com/profile/Jaron-Blossomgame-58760/Basically, he's a long, explosive, slightly skinny 6'7 SF who hadn't shown much besides an ability to finish above the rim before this season. He's 22, turns 23 in September. He's dramatically improved his 3pt percentage on increased volume (first two years: 27/109; this year, 44/99). He's also increased his assist rate to a still-mediocre 1.7 per 40 while cutting his TOV% from 12 to 10%.
His defensive effort was also flagged as an issue, and it's encouraging that he's also significantly increased his block rate (first two years: 0.55 blocks per 40; this year: 1.3). However, his rebounding numbers are significantly down on both ends, after looking like a major strength after his sophomore season.
His main weakness seems to be age. He'll be almost 23, which will keep him out of the 1st round and probably the early 2nd, but he seems like good value in the 40's.