Dad's 70th

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Across
  1. 3. Holy city
  2. 7. Subject of old digs
  3. 9. Elder in the clan, perhaps
  4. 12. Summer footwear
  5. 14. Father
  6. 15. Chest-strengthening exercise
  7. 17. Relatives, nuclear or extended
  8. 18. TREE Source of a sour fruit with roots
  9. 19. FOOD Hot stuff on a plate
  10. 20. Biblical lifespan of three score and ten
Down
  1. 1. Man’s name – Gere, Burton, Hammond...
  2. 2. Spirit, or W in phonetic alphabet
  3. 4. Go abroad, perhaps
  4. 5. CHOCOLATE Bitter-sweet indulgence
  5. 6. Medic, or to falsify
  6. 8. Puzzle with intersecting entries
  7. 10. French car brand
  8. 11. Rhyming slang for hair, or surname
  9. 13. Green citrus fruits
  10. 15. Many-sided figure
  11. 16. Sport with strokes, or floundering about