Crossword Genius

Foreigner back from Breslau (4)

Ross

I believe the answer is:

serb

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'foreigner back' is the definition.
Although both the answer and definition are adjectives, I can't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for serb that I've seen before include "Someone from Belgrade?" , "From Belgrade, perhaps" , "Balkan native" , "One from Belgrade" , "Native of the Balkans" .)

I've seen this clue in the Evening Standard.
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