Back in the Jam

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Across
  1. 3. an agreement, usually a formal one
  2. 6. playful or mischievous pranks; shenanigans
  3. 7. not harmful; kind and generous
  4. 8. very profitable
  5. 10. a rich harvest or sudden good fortune
  6. 11. a part or piece of something greater
  7. 12. an idea
  8. 13. a puzzling situation or person
Down
  1. 1. to spoil the appearance of something
  2. 2. to yield; to surrender; to give in
  3. 4. reasonable; sensible
  4. 5. calm and peaceful
  5. 9. going on forever; having no boundaries
  6. 12. to quote something as an authority