Crossword Genius

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

Ross

I believe the answer is:

barnacle

(Other definitions for barnacle that I've seen before include "A shellfish that sticks to objects under water" , "Crustacean that sticks to rocks etc" , "On the coast it's hard to remove" , "underwater attachment" , "hanger-on" .)

I've seen this clue in The Guardian.
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