KELP

Large leathery brown seaweed (4)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 16,132 — 2022-01-20 00:00:05
  9A: Large seaweed with long, tough stalks (4)
• Quick crossword No 15,577 — 2020-04-09 23:00:28
  19D: Large brown seaweed (4)
• Quick crossword No 15,324 — 2019-06-18 23:00:09
  11A: Large leathery brown seaweed (4)