Horrible Homophones

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Across
  1. 3. found in labs and bars in equal measure
  2. 4. expressing sorrow for the dead. Might be confused for the beginning of the day
  3. 8. people who take too much, also the famous rat from Harry Potter.
  4. 9. (clue in 6 down) homophone of being banned from a store.
Down
  1. 1. classical poet often confused by similarly-named yellow cartoon counterpart.
  2. 2. "cogito, ergo sum" or Ricky Martin for example.
  3. 4. Knights of old and hikers in North America might use this.
  4. 5. "wow, this song really is [metal installation disallowing the passage of solid objects]"
  5. 6. (clue in 9 across)A homophone of a jolly musical man.
  6. 7. The 23rd letter of the Greek alphabet or the unit for measurements under pressure.