Food a foreigner takes with a bit of sauce (7)
I believe the answer is:
lettuce
'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?" .)