The First One

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Across
  1. 2. to be...in or at: to be well instructed or ‘up to the mark’ in, thoroughly conversant with, expert or skilful in.
  2. 3. bitterly pungent to the organs of taste/smell, or to the skin,; irritating; corrosive
  3. 5. friendly, good-natured; approachable
  4. 6. an event or period marking a turning point in a course of action or state of affairs.
  5. 7. to improvise actions, words, music, etc., esp. in the course of a stage or broadcast performance. Also more generally: to deal with circumstances as they present themselves.
  6. 9. repugnant; hateful, detestable
  7. 10. the spirit or genius which marks the thought or feeling of a period or age.
  8. 11. to hide oneself; to flee into hiding; or to an inaccessible place; to leave hurriedly and secretly, typically to elude a creditor, escape from custody, or avoid arrest
  9. 13. circling course, revolution (of time or events)
  10. 15. an act justifying, or regarded as a reason for, war.
  11. 16. the point of the sky directly overhead; fig. Highest point or state, culmination, climax, acme
Down
  1. 1. to cause to cease; to do away with; to put an end to or remove (a nuisance)
  2. 2. to repeal (a law, established usage, etc.); to abolish authoritatively/formally; to annul, to cancel
  3. 4. in a catty manner.
  4. 5. to a sickening or nauseating extent; to a tiresomely excessive degree.
  5. 8. means, esp. pecuniary means; resource or supply (esp. money) needed for the purpose in view.
  6. 9. of a problem, crisis, etc.: severe, intense; pressing, urgent.
  7. 11. at one's pleasure or discretion; at will, as one pleases
  8. 12. to agree, esp. tacitly; to accept something, typically with some reluctance; to agree to do what someone else wants; to comply with, concede.
  9. 14. of a person: moderate, not self-indulgent, esp. in eating and drinking.