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Clark is a mentioned-only character in Nuka-World.
Clark was the writer of the holotape "For Deke", describing the location of a loot cache in a footlocker under the bridge near the Nuka-Cola bottling plant. Clark and Deke had obtained some "goods" (possibly stolen), and Clark, fearing that Deke would double-cross him, decided to place the holotape in a toolbox at the assigned meeting place instead of actually meeting him there. Clark's stash key is found with the holotape and unlocks the footlocker containing Deke's half of the goods.
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