Crossword Genius

Marine detritus (6)

Ross

I believe the answer is:

jetsam

(Other definitions for jetsam that I've seen before include "Goods jettisoned from a ship and washed up on shore" , "Floating rubbish" , "What's thrown out" , "Floating wreckage" , "Objects thrown overboard" .)

I've seen this clue in The Times and The Sunday Times.
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