He’s played NT, 1T, 3T, and 5T for GB over the years, although I doubt he has the juice for that anymore. The Packers were probably going to part ways with Clark after this season so they included him in the deal to sweeten the pot and unload his contract before signing Parsons.
Completely agree that GB wasn’t going to trade him without need. That said, he might be available mid year if The Cowgirls tank and Jerruh decides to unload guys for draft capital.