Some passer-by from Belgrade? (4)

I believe the answer is:

serb

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'some passer-by from belgrade?' is the definition.
I can't judge whether this defines the answer.

'some passer-by from' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'SERB' is hidden within 'passer by from'.

Can you help me to learn more?

(Other definitions for serb that I've seen before include "One from Belgrade" , "Someone from Belgrade?" , "A European national" , "Eg, native of Belgrade" , "Eastern European" .)

I've seen this clue in The Globe and Mail.

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