DIEHARD

Obstinately resistant to change (3-4)

Solution has appeared in 2 crosswords (2 across and 0 down):

• Quick crossword No 16,533 — 2023-05-02 23:00:52
  24A: 1988 film starring Bruce Willis (3,4) — one strongly opposing change (7)
• Quick crossword No 16,025 — 2021-09-15 23:00:00
  12A: Obstinately resistant to change (3-4)