BONES!

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Across
  1. 3. The back of you calf
  2. 4. __by Lorde
  3. 8. Makes up you spine
  4. 10. A bone to make you laugh?
  5. 13. Protects your thoughts
Down
  1. 1. The counterpart of 3 across
  2. 2. Munch
  3. 5. Between 4 across
  4. 6. Rhymes with Elvis
  5. 7. Biggest in the bunch
  6. 9. A knife that doesn't cut
  7. 11. The smallest in the bunch
  8. 12. A part of a circle
  9. 13. Meant to break