Top Secret Santa

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Across
  1. 2. What Santa keeps until Christmas morning (6)
  2. 7. Like the women during apparition (6)
  3. 10. Group associated with symbols like the eye in a triangle (10)
  4. 12. Undo tangled yarn (7)
  5. 13. Presents given on special occasions (5)
  6. 14. Concealed beneath the surface (6)*
  7. 16. Out of sight (6)
  8. 19. An unexpected event or gift (8)
  9. 22. It might have 1,000 pieces (6)
  10. 23. A puzzle with intersecting words (8)*
  11. 26. Hilltop college (3)
  12. 27. Behind-the-scenes leader
  13. 28. The _______ Singer (6)
  14. 29. He delivers presents on Christmas (5)
Down
  1. 1. Something given (7)
  2. 3. A piece of evidence or hint (4)
  3. 4. Better half, often seen with a wedding band (7)
  4. 5. A puzzling question (6)
  5. 6. A subtle nudge in the right direction (4)*
  6. 8. What you wear to conceal your identity (8)
  7. 9. Where true beauty is found (6)*
  8. 11. Member of a secretive organization known for rituals (5)
  9. 15. Something difficult to understand (7)
  10. 17. Earth-shattering in innovation (12)
  11. 18. Having hidden meaning (7)
  12. 20. Detective (6)
  13. 21. Covered with paper, like a gift (7)
  14. 24. It might curl at the ends (8)
  15. 25. Creature often found leaving a silver trail in gardens (5)