Crossword Genius

Ham is doubly processed food (7)

Ross

I believe the answer is:

sashimi

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sashimi that I've seen before include "dish from Japan" , "food in Japan" , "fish food?" , "possible accompaniment to 26 [SAKI]" , "Something of chef's" .)

I've seen this clue in The Daily Express.
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