Jinn Slinger

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Across
  1. 2. Opposite of out
  2. 4. You send this in the post (I barely know her)
  3. 5. The start of this sentence
  4. 7. In the process of killing someone
Down
  1. 1. Six places after third
  2. 3. An organisation of letters
  3. 6. Not mine, but… (-s)
  4. 8. Two letter word that is within this sentence