Back in the Jam

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