Clue: Narcissists' interests (one of which can be found in each of the puzzle's longest answers)

Answer: EGOS

Length: 4

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Similar Clues:

• Regular stuff found inside this puzzle's three longest answers (GAS with 3 letters)
• Sequence found in this puzzle's five longest answers (AEIOU with 5 letters)
• Shades of it begin this puzzle's four longest answers (BLUE with 4 letters)
• Big fight, and clue to this puzzle's theme that begins the four longest answers (BOUT with 4 letters)
• Postseason gridiron game, and a hint to the puzzle theme found in starred answers (BOWL with 4 letters)
• "The wart stops here" product, and a hint to the theme found in eight puzzle answers (COMPOUNDW with 9 letters)
• 'Old MacDonald' sequence found in this puzzle's 10 longest answers (EIEIO with 5 letters)
• Surplus integral to this puzzle's theme answers (EXCESS with 6 letters)
• 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) (FOUR with 4 letters)
• Easter bunny's spring, found in this puzzle's nine longest answers (HOP with 3 letters)