Porous mass found in oceans (6)

I believe the answer is:

sponge

(Other definitions for sponge that I've seen before include "Porous substance to absorb liquid" , "Sea creature often found in bathroom" , "No pegs on this substance to soak up" , "Ask for money" , "Aquatic creature - cadge" .)

I've seen this clue in The Irish Times.

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