Double letters

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Across
  1. 4. abduct (someone) and hold them captive, typically to obtain a ransom
  2. 8. show approval or praise by clapping.
  3. 9. not suitable or proper in the circumstances.
  4. 10. the presence in or introduction into the environment of a substance which has harmful or poisonous effects.
  5. 11. a group of people living in the same place or having a particular characteristic in common.
  6. 12. recognize the full worth of.
Down
  1. 1. an idea or plan put forward for consideration
  2. 2. have or express an unfavourable opinion
  3. 3. the action or process of adding something to something else.
  4. 5. the technical equipment or machinery needed for a particular activity or purpose.
  5. 6. causing shock or dismay; horrific
  6. 7. pleasing or appealing to the senses.