9th

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Across
  1. 1. unwanted result of something ( noun)
  2. 5. know something / place new
  3. 6. essential
  4. 7. positive and beneficial ( noun)
  5. 8. antonym for encourage
Down
  1. 2. synonym for user
  2. 3. synonym of enhance or encourage
  3. 4. to give something to someone