Crossword Genius

Food a foreigner takes with a bit of sauce (7)

Ross

I believe the answer is:

lettuce

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lettuce that I've seen before include "food" , "Lamb's -; iceberg -" , "Part of a BLT" , "Plant for the salad bowl" , "Cos or iceberg?" .)

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