First and foremost, preheat the oven at 350°F. Also, keep the bundt pan prepared by greasing it beforehand.
Stir together the cinnamon, ginger, nutmeg, allspice, and ground cloves in a small bowl until thoroughly combined.
In a large bowl, add flour, gingerbread spice, salt, baking powder, and baking soda and whisk them.
In another bowl, add butter and brown sugar. Then, beat them until they are fluffy.
Add eggs one by one and beat them into the mixture. Add the molasses to it as well and stir it.
Add the flour mixture into this mixture in three parts and mix well. Add some water to it and make the batter smooth.
Pour the batter into the bundt pan and bake it for about an hour. Then, take it out and let it cool on a wire rack for about 10 minutes.
After that, mix rum, sugar, and gingerbread spice blend in a bowl and brush the glaze over the cake. Your gingerbread bundt cake is ready!