BARNACLE

Marine crustacean, which lives attached to submerged surfaces (8)

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

• Quick crossword No 16,319 — 2022-08-25 23:00:16
  11D: Lean crab (anag) — one with a hard shell (8)
• Quick crossword No 16,069 — 2021-11-06 00:00:17
  20A: Marine crustacean, which lives attached to submerged surfaces (8)