Here are the possible solutions for letter that appears 28 times in this grid clue
Answer
Clue
Relevancy
ess
Clue
Letter that appears 28 times in this grid
Definition
the letter S, also ES
tee
Clue
Letter that, as it appears in the middle of this grid, can precede the first words of the starred entries
abe
Clue
Puzzle theme which appears nine more times in the grid
four
Clue
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)
Number of times the letter 'U' appears in each of this puzzle's eight longest answers
Minimum number of times each letter of the alphabet appears in this puzzle's solution
Definition
the cardinal number next above three
horizontal
Clue
How this entry appears in the grid
Definition
parallel to the horizon
rey
Clue
King, to Juan[LAST WEEK: The hidden name was Claudette Colbert, whose name appears across the grid's center row as CLAW / DEBT / COAL / BEAR.]