Preheat the oven to 375°F and lightly grease a loaf pan. In a large bowl, combine the ground lamb, rolled oats, egg, onion, garlic, cumin, coriander, cinnamon, paprika, salt, and black pepper. Mix just until evenly blended.
Press the mixture firmly into the prepared loaf pan. Bake for 45 to 50 minutes, until the internal temperature reaches 160°F. Let the meatloaf rest for 5 minutes before slicing.
While the meatloaf bakes, bring the vegetable broth to a boil in a medium saucepan. Stir in the couscous, cover, and remove from heat. Let it stand for 5 minutes.
Fluff the couscous with a fork, then gently stir in the chickpeas, parsley, and lemon juice. Serve slices of meatloaf alongside the warm couscous.