In 23 cm pie plate, combine gingersnap crumbs and 1 tb brown sugar. Drizzle with melted margarine. Pat crumbs into bottom and up side of pie plate to make crust; set aside.
In blender, sprinkle unflavored gelatin over cold milk; let stand 2 minutes. Add hot milk and process at low speed until gelatin is completely dissolved, about 2 minutes. Add pumpkin, cream cheese, 0.75 c brown sugar, vanilla, cinnamon, salt and cloves. Process at high speed until thoroughly blended, scraping sides frequently, about 5 minutes. Pour into prepared crust. Chill until firm, about 3 hours. Top with whipped topping.