Cut squash in half lengthwise; discard seeds and fiber. Place, cut side down, in microwave-safe baking dish. Cover and microwave on High 4 minutes; turn squash over and rotate dish. Cover and microwave on High 4 minutes, or until squash is tender, yet firm. Meanwhile, saute onion in hot oil in large skillet over high heat until translucent. Add turkey and apple; cook and stir over medium heat 5 minutes, or until turkey is no longer pink. Sprinkle flour evenly over meat mixture; stir to blend. Gradually stir in lite soy sauce; cook, stirring, until slightly thickened. Stir in raisins; remove from heat. Fill squash halves equally with turkey mixture. Cover loosely; microwave on High 1 minute to thoroughly heat filling.