Crossword Genius

Crustacean that lives attached to rocks (8)

Ross

I believe the answer is:

barnacle

(Other definitions for barnacle that I've seen before include "Shellfish that sticks to things" , "Marine crustacean (attaching to rocks, ships etc.)" , "Crustacean that attaches to a submerged surface" , "Hull resident (one who clings on)?" , "Be carnal consuming this shellfish" .)

I've seen this clue in the Sydney Morning Herald.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.