Is he among the lesser brethren abroad? (4)

I believe the answer is:

serb

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'is he' is the definition.
The definition suggests a singular noun but the answer is not.

'among the lesser brethren abroad?' is the wordplay.
'among' says the answer is hidden in the clue.
'SERB' is hidden in the letters of 'lesser brethren abroad'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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