Alias Jack, alias Jackie

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Across
  1. 3. Catch for Saint Pierre
  2. 5. Long form for Hobbit author
  3. 8. Corn tortilla and home fries, topped with two eggs (medium over), 'Spanish sauce', and cheese, all contained in a sausage pattie moat
  4. 9. Pogo by another name
  5. 11. You might travel for miles to hear him when the sun goes down
  6. 12. 4.5L, round bodied, small-necked glass vessel, purportedly named after دامغان, in the province of سمنان
  7. 14. Sir Harrington’s shifting seat of ease
  8. 16. When repeated, the name of his son
Down
  1. 1. Order for Vito at a New Hampshire diner
  2. 2. Made a floral declaration on the thirteen United States of America
  3. 4. Gave Divine guidance (or stage direction)
  4. 6. Well if it isn’t James Cagney gettin’ on the bandwagon
  5. 7. Young apostle finds a herbal remedy for his sorrows
  6. 10. Uncle Sam tries on iconic Geri Halliwell ‘fit.
  7. 13. Wojtyła, to some
  8. 15. Would make for a palindromic opening to a wartime breakup letter