What's the word?

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Across
  1. 3. The adverb of polite
  2. 4. A gas that is colourless and odourless
  3. 6. No ______ is available yet for COVID 19
  4. 9. The ______ weight of a cow is 1350 lbs
  5. 10. Removing trees to create open areas
  6. 12. A feeling that someone is dishonest
Down
  1. 1. A large, fortified building, usually old
  2. 2. The occurrence of an infectious disease
  3. 5. Land covered with grass, suitable for cows
  4. 7. To surround someone so they cannot leave
  5. 8. A person who does not eat meat or fish
  6. 11. To say firmly that something is true