OAKUM

Loose fibre got by unravelling old ropes, once used in caulking wooden ships (5)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 16,681 — 2023-10-22 23:00:28
  20A: Loose fibre from old rope (5)
• Quick crossword No 16,625 — 2023-08-17 23:00:33
  17D: Loose fibre got by unravelling old ropes, once used in caulking wooden ships (5)