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
This puzzle's theme found in the answers to five asterisked clues
"Be careful what you say," and a hint to a feature shared by this puzzle's perimeter answers
Topographic feature represented in this puzzle's circles
Enola Gay, e.g. (and a hint to this puzzle's unusual feature)
A feature of this puzzle
Picnic serving, and when divided properly, a hint to a hidden feature of six pairs of puzzle answers
Puzzle book feature
Some shoes ... and a feature of this puzzle's theme
Feature of this puzzle's three long Down answers
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
Wee hr., and a hint to a feature common to this puzzle's four longest answers
Like the Oscars ... or the answers to this puzzle's seven asterisked clues?
Radio studio feature, and what each of this puzzle's four other longest answers literally is
Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle
Item missing in this puzzle's theme that's absent as well in the fill and clues
Feature of this puzzle?
Visual representation of an item associated with the answers to the asterisked clues in this puzzle
What this puzzle's theme (and some of its clues) received?
Feature of this puzzle's theme answers?
Sorted alphabetically (like this puzzle's clues)
What can be said about the answers to this puzzle's capitalized clues
TV feature, and a clue to six other answers in this puzzle
1969 Cream hit ... or a hint to the seven "mathematical" clues in this puzzle