Sauté Aromatics: Using the highest sauté or browning function on the pressure cooker, heat olive oil until shimmering. Add onions, salt, and pepper, cooking until softened (about 5 minutes). Stir in thyme, red pepper flakes, and three-quarters of the minced garlic, cooking until fragrant (about 30 seconds).
Build the Stew: Stir in tomatoes, reserved juice, clam juice, wine, raisins, and capers. Nestle swordfish into the pot, spooning some of the cooking liquid over the top.
Pressure Cook: Lock the lid in place and close the pressure release valve. Cook on high pressure for 1 minute, then quick-release pressure. Carefully remove the lid, allowing steam to escape away from you.
Prepare the Topping: In a small bowl, combine pine nuts, mint, orange zest, and remaining garlic. Adjust consistency with hot water if needed.
Season and Serve: Season the stew with salt and pepper to taste. Serve in bowls topped with the pine nut mixture, accompanied by crusty bread or garlic toast.