Portmanteau 7: Puzzled?

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Across
  1. 3. something you need to do to keep food warm in Antarctica
  2. 4. A basketball team and a tribe
  3. 6. A classic Mexican food
  4. 9. Land of snow and mountains
  5. 10. Very illuminating, this.
  6. 11. A place near Siachen
Down
  1. 1. A writing script
  2. 2. A surreal form of art
  3. 5. A French singer
  4. 7. A painter that had a whimsical style
  5. 8. Drug lord or painter?