"Defeat Clements" is an objective in the sidequest Victims of Vault Hunters in Sir Hammerlock vs. The Son of Crawmerax.
Walkthrough[edit]
Head to the Northeast along the walkway to reach the next doorway. Just keep to the walkway and follow it to the marked door on your map.
Dialogue[edit]
Sparky Flynt: Next guy, who's probably frigging dead already, is a Hyperion scientist named Clements. He wants Krieg cuase you killed some dudes when you escaped or something. I don't even care at this point.
Sparky Flynt: Yeah. Great. Figures. I got one assassin left, jaggoffs. Just go and find his corpse already.