Crossword Genius

Elderly relatives transfixed by Brussels body, one serving Europeans (8)

Ross

I believe the answer is:

grecians

'elderly relatives transfixed by brussels body' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'one serving europeans' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
This explanation may well be incorrect...

(Another definition for grecians that I've seen is " Classics scholars".)

I've seen this clue in The Everyman puzzle in The Observer.
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