Crossword Genius

Sedentary marine invertebrate (6)

Ross

I believe the answer is:

sponge

(Other definitions for sponge that I've seen before include "Sea animal often found in bath" , "Porous mass in oceans" , "Marine animal with ability as at 3 Down" , "Parasite" , "Cadger" .)

I've seen this clue in The Times.
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