Batman

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Across
  1. 4. A very puzzling villain
  2. 5. The clown of Arkham Asylum
  3. 6. Poison ___
  4. 7. Loves to get her paws on jewels
Down
  1. 1. ______ Quinn
  2. 2. Owner of the Iceberg Lounge
  3. 3. Harvey Dent's alter ego