Love is a mystery

1234567891011121314151617
Across
  1. 4. Yesterday’s challenge starts modelling model, by knock-out’s first class, Ivan’s start and origin, with a last letter knock-out (2,10)
  2. 6. Endless slack scrambles a capital (4)
  3. 10. Start sixty percent plus balm for strong drink (3,3,5)
  4. 11. Covers hand without head for a warm feeling (4)
  5. 13. Never hugging a right cold country (6)
  6. 14. Coded angry talk becomes this (7,9)
  7. 15. Your age is a second occasion starting yonks ago (7)
  8. 17. Section sounds like a question for festivity (5)
Down
  1. 1. Norwegian hike, Norwegian’s live, Australian campervan (5)
  2. 2. Steep suburb shape, a sound like a Gang Gang talking (7,5)
  3. 3. Vehicle rubbish is appealing stick (6)
  4. 4. Gibson and Jason at your home Down Under (9)
  5. 5. Hours practicing after a note, in front of Australia, at the Opera House (6,2)
  6. 7. Us, here, sorting mail inside folksy covers (6)
  7. 8. Favourite spot for ball’s ball (7,4)
  8. 9. Surround ambient music with just enough to be an improvement (10)
  9. 12. Former winner in a bar (3,4)
  10. 16. First time ever at every breakfast, 11am, 1pm, and 4pm (3)