Crossword Genius

Bottomless vessel full of American food (5)

Ross

I believe the answer is:

sushi

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'food' is the definition.
(sushi is a kind of food)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sushi that I've seen before include "Cold rice balls with raw fish" , "Rice, seafood cuisine" , "Exotic food" , "Japanese cuisine" , "Japanese vinegared rice dish" .)

I've seen this clue in The Sunday Times.
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