Tragg Star

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