Ben Hur's brother? (6)

I believe the answer is:

arthur

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'brother?' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'ben hur's' is the wordplay.
'ben' becomes 'art' (I can't explain this - if you can you should give a lot more credence to this answer).
'art'+'hur'='ARTHUR'

Can you help me to learn more?

(Other definitions for arthur that I've seen before include "- - Lowe (actor)" , "Old king" , "Greed" , "Legendary king of the Britons" , "Excalibur king" .)

I've seen this clue in the Evening Standard.

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