Feature replaced in four clues in this puzzle

Question:

Answer:

CAPITALLETTER

Length:

Similar Crossword Questions:

Feature of this puzzle, and where the theme clues ought to have ended up
Word needed to be added to 12 appropriately placed answers in this puzzle for their clues to make sense
Enigmatic feature of this puzzle's subject
Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle
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