Something media related

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Across
  1. 1. To cast down or to hasten.
  2. 4. 6 letter word, people holding a gainsay contest for the entertainment of academic people.
  3. 5. 5 letter word, frequencies are inter positioning to bring talk shows and songs.
  4. 6. To render/declare void or inoperable.
  5. 9. Having no authority or binding force; to disown.
  6. 11. 10 letter word, they are useless gadflies.
  7. 13. A hypocritical show of religious devotion.
  8. 15. The feeling of quiet security, unaware of danger.
  9. 16. Present, but not visible/apparent.
  10. 20. To administer anaesthesia.
Down
  1. 2. 11 letter word, what people learn/gain to become cognizant.
  2. 3. Based in a system positing that authority knows best.
  3. 7. 7 letter word, different radio broadcasts are shown as video on clarion screens.
  4. 8. 8 letter word, an elegy was written for the deceased.
  5. 10. To caution, advise, or scold/reprove.
  6. 12. 6 letter word, conversation made in laxity.
  7. 14. Brilliantly clever, witty, or animated.
  8. 17. 6 letter word, when news/video companies go on moratorium.
  9. 18. 7 letter word, block of text following the zeitgeist of the news.
  10. 19. 9 letter word, the daily provincial on-goings.