What is the answer to "21st of 24 letters" in the WSJ Crossword?

The answer to the WSJ Crossword clue "21st of 24 letters" is PHI (3 letters).

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WSJ

21st of 24 letters WSJ Crossword Clue

Down clue · from the August 5, 2026 puzzle

Stuck on “21st of 24 letters” from the Wall Street Journal Crossword? Here is the verified answer:

Answer

PHI

3 letters · Down · last seen August 5, 2026

1AMaker of Primavera scooters5 1DSAT prep study5 2DSherlock’s sister in a series of Millie Bobby Brown movies5 3DElite fighting group5 4DPocketful in a nursery rhyme6 5DPay to play4 6DBOLO kin3 6ABook containing the Believers’ Prayer4 7DSuggestion to a crayon-wielding child, and a hint to four rows of this puzzle15 8DStrong suit5 9DStrengthens6 10A“Honey, Honey” singers4