Filed from 6 published puzzles

KERNEL

Set to 6 different clues across 6 published puzzles, most often “Central part” — The New York Times, Wednesday, 18 March 2009.

6 letters

Every clue on record, most used first

  • Central partonce

    The New York Times — Wednesday, 18 March 2009

  • Heartonce

    The New York Times — Saturday, 7 June 2003

  • Gistonce

    The New York Times — Thursday, 25 January 2001

  • Essenceonce

    The New York Times — Wednesday, 29 November 2000

  • Bit of truth?once

    The New York Times — Wednesday, 15 March 2000

  • Part of an earonce

    The New York Times — Friday, 5 June 1998

Other answers to these clues