Seven unmarked clues share the definition of staple (13-down,9-across)s. And your time starts... now!

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Across
  1. 4. Grand reworking of middle name (6)
  2. 5. Musically, a rock festival (8)
  3. 7. Former suburb has no port (4,4)
  4. 8. Dawdle around beloved Youtuber (4)
  5. 9. See 13-down
  6. 11. Missing beer? Got nothing!? (9)
  7. 15. Going down South (7,5)
  8. 17. Flower meadow is the new home base (9)
Down
  1. 1. Ship circles select sand spot (6,3,6)
  2. 2. Bride goes!? Life is a mess (6,2,4)
  3. 3. Country native confused male (7)
  4. 6. Cow meets alien? Prepare a picture! (6,5)
  5. 10. Birthday twin makes Prince's floor slabs? (5,6)
  6. 12. Headless leafy vegetable on grill (4,4)
  7. 13. Test display of your favourite genre? (4,4)
  8. 14. Striped beasts features Disney CEO being hugged by Taylor Swift (6)
  9. 16. Chinese tea in the South East (3,5)