Plantlike marine animal with a porous body (6)

I believe the answer is:

sponge

(Other definitions for sponge that I've seen before include "Absorbent cleaner - cadge" , "Porous fibres for soaking up" , "Porous substance found in the ocean" , "Soft, absorbent material used for washing" , "Aquatic creature; cake" .)

I've seen this clue in The Times.

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