CORE

Kernel (4)

Solution has appeared in 4 crosswords (3 across and 1 down):

• Quick crossword No 16,526 — 2023-04-24 23:00:20
  8A: Essence (sometimes hard) (4)
• Quick crossword No 16,033 — 2021-09-24 23:00:26
  3D: Apple centre (4)
• Quick crossword No 15,623 — 2020-06-02 23:00:23
  16A: Heart of the matter (4)
• Quick crossword No 15,272 — 2019-04-18 23:00:36
  21A: Kernel (4)