Returning with sailor, popped outside for something to eat (9)

I believe the answer is:

bratwurst

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'for something to eat' is the definition.
(bratwurst 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 bratwurst that I've seen before include "German port sausage" , "German pork sausage" , "Type of German sausage" , "banger" .)

I've seen this clue in The Telegraph.

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