Crossword Genius

Japanese food thrown up in club (4)

Ross

I believe the answer is:

nori

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'japanese food' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nori that I've seen before include "seaweed" , "oriental food" , "Japanese food" .)

I've seen this clue in The Times.
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