It depends on what they would net in return. But Clowney looks like he's going to be the real deal. He has a prototypical build for the NFL and a wide array of moves he uses to beat opposing LT's. Pairing him with Watt on the same line would be a nightmare for any of the QB's in that division.
If Haslam has the woody for Manziel that has been reported it is possible they could get both of Cleveland's 1st rounder's for him, especially given the number of picks the Browns have in addition to those firsts.