Crossword puzzle clue "one is hidden in each of today's theme entries"

One is hidden in each of today's theme entries

Theme answer count, amount of letters in each, word hidden in each, and, when repeated twice, today's date

Word hidden in each of the theme entries

Sports org. hidden in each of this puzzle's longest entries

There's one at the beginning of each of this puzzle's four theme entries

Like each answer in this puzzle - also each word in each clue - in length

Nickname for the three-letter abbreviation hidden in this puzzle's theme entries

They're hidden in this puzzle's theme entries