A Potterhead, are you?

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Across
  1. 2. Part of an anagram of Tom Marvolo Riddle. 9 letters.
  2. 7. The most powerful dark wizard after He who must not be named. 11 letters.
  3. 8. The only child and daughter of Xenophilius and Pandora. 4 letters.
  4. 9. Framed of opening the Chamber of Secrets. 6 letters.
  5. 10. A werewolf who taught Harry how to conjure a Patronus. 5 letters.
  6. 11. Death eater and a cousin of Sirius Black. 9 letters.
  7. 13. The only other person who found Tom’s diary apart from Harry. 5 letters.
Down
  1. 1. “Have a biscuit, Potter.” 10 letters.
  2. 3. Said "Happiness can be found, even in the darkest of times, if one only remembers to turn on the light." 10 letters.
  3. 4. Shared the ambiguity about Trelawney’s prophecy with Harry. 10 letters.
  4. 5. Took over Dumbledore’s position at Hogwatrz when the former was fired. 7 letters.
  5. 6. American witch originally named Propentina is affectionately called? 4 letters.
  6. 12. Dobby’s old master. 6 letters.