Grandpa

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Across
  1. 1. Place to write letters (9)
  2. 3. Table game (4-4)
  3. 5. Organized body of knowledge (7)
  4. 6. Single stroke over par (5)
  5. 11. Specialist in numbers (13)
  6. 12. Lawn game that uses hoops and mallets (7)
  7. 13. Bird that's 'bald'(5)
  8. 14. A person who builds and maintains machines (8)
  9. 16. Methodical, careful (8)
  10. 17. "I'm ___ of a big deal" (4)
Down
  1. 2. "Glass half-full" outlook (8)
  2. 4. This clue has been originally contrived (9)
  3. 7. Holiday home on wheels (7)
  4. 8. Item that might have a mouse or bugs (8)
  5. 9. Feathered cork (11)
  6. 10. Acorn that made it (3)
  7. 15. Like a light breeze (6)