5.

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Across
  1. 5. Relaxation is about posture (6)
  2. 6. Loathing what ingratitude is about
  3. 8. Cartoon is about syndicates (9)
  4. 9. Space is about what is in first letters (4)
  5. 11. Riot act is about cheese (7)
  6. 12. A vote is what the revolution is about (4)
Down
  1. 1. Counsel is about privacy (9)
  2. 2. Report is about overdue
  3. 3. Is about to fall
  4. 4. It is taken from a book but is about right
  5. 5. Meal is about over
  6. 7. "Old" is about ... about a hundred and one (7)
  7. 10. Wager is about insects