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Idina Menzel was green before green was the new black. Eco-excellent: Well, she was also black-hatted. But then, when you're portraying the green-glittered "Wicked" Witch of the West, which end is up is sometimes a cauldron of bewitching contradictions. Which, in a way, is how she ends up on the Keswick Theatre ( www.keswicktheatre.com ) stage, where the woman who...