Ham is doubly processed food (7)
I believe the answer is:
sashimi
'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" .)