To make the syrup: In a small heavy saucepan, bring the agave nectar, star anise, ginger and clove to a boil over medium-high heat. Remove from the heat and let cool completely then strain into a small bowl.
To make the cranberry reduction: In a small, heavy, non-aluminum saucepan, bring the cranberry juice to a boil over medium-high heat. Cook for about 7 minutes or until reduced to 1/2 cup. Transfer to a small bowl and let cool completely; the cooled reduction will be quite thick.