Oklahoma Indian (and a three-word description of this puzzle's theme)

Question:

Answer:

OTOE

Length:

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Like this answer, or a two-word description of this puzzle's theme
This puzzle's theme word
Just making things up, or a synonym for a three-word phrase describing this puzzle's theme entries
Possible theme, but not a description of this puzzle
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Word that has two diametrically opposed meanings (like this puzzle's eight theme entries)
This puzzle's key theme word
Theme word inside this puzzle's theme words
It can follow the last word of this puzzle's theme entries
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Economic term named the 2011 Word of the Year by the Oxford English Dictionary...and a description of 6 squares in this puzzle
Word hidden in this puzzle's theme entries
Word before the first word in this puzzle's theme answers
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This puzzle's obvious theme word
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
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Require forbearance -- and what this puzzle's theme might do
Item missing in this puzzle's theme that's absent as well in the fill and clues
Thing that might be upset ... and what is "upset" in this puzzle's scrambled theme
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Theme of this puzzle?
Word or phrase with no repeated letters, such as every answer in this puzzle