Explanatory information about this puzzle is revealed by reading these in the clues

Question:

Answer:

LASTLETTERS

Length:

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What this puzzle's theme (and some of its clues) received?
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Sorted alphabetically (like this puzzle's clues)
This puzzle's theme found in the answers to five asterisked clues
This completed puzzle has 10 of them, each three letters long, reading diagonally
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Puzzle clues, sometimes
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Feature replaced in four clues in this puzzle
Legal maneuver ... with a hint to answering seven clues in this puzzle
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There is an important one spelled out by the last characters of this puzzle's clues, starting from the top
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Your role in this puzzle [the asterisked clues will help you crack the case]
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Feature of this puzzle, and where the theme clues ought to have ended up