Cook the linguine in a large pot of well-salted boiling water according to package directions, but pull it about 1 minute early so it's just barely al dente. Drain and set aside.
While the pasta cooks, heat the olive oil and butter in a large skillet over medium heat. When the butter melts, add the onion and garlic. Sauté for 2 to 3 minutes, until the onion softens and the garlic is fragrant.
Add ¾ cup of the reserved clam juice, white wine, and Worcestershire sauce to the skillet. Bring to a boil, then reduce the heat and simmer gently for about 10 minutes, until the sauce reduces slightly and the flavors meld together.
Add the cooked linguine, chopped clams, and parsley to the skillet. Toss to combine and coat the pasta with sauce. Season with salt and pepper to taste.
Simmer for about 5 more minutes, tossing occasionally, until the sauce is mostly absorbed and clings to the pasta.
Serve immediately with grated Parmesan cheese, fresh lemon wedges, extra parsley, or crushed red pepper flakes.