Anne's puzzle

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Across
  1. 3. they're Among Us?
  2. 5. the moon, or AATAT
  3. 6. First name of beloved Discworld fantasy writer, or beloved former Whitehead PI
Down
  1. 1. The best Yamashita lab senior scientist!
  2. 2. DC's baseball team, if they were Dipterans
  3. 4. The Apollo Lunar ___, or former Broad head