Preheat oven to 375 degrees F. Grease and flour a 10- inch bundt pan.
In a large bowl, blend cake mix, pudding mix, oil, water and eggs for 30 seconds. Scrape down sides of bowl and beat at medium speed for 2 minutes.
Spread 3/4 of the batter evenly into the bundt pan.
In a small bowl, stir together the flour, brown sugar, cinnamon and melted butter. Sprinkle 2/3 cup of streusel mixture over the batter in the pan. Spread the remaining batter over the streusel. Top with the remaining streusel.
Bake for 40 to 50 minutes until a cake tester or long skewer inserted into the cake comes out clean. Place cake on a cooling rack and let cake cool upright in the pan for 20 minutes. Invert cake onto serving tray and drizzle with glaze.
Blend powdered sugar and milk together until smooth. Drizzle over cake.