Crossword Genius

Old king whose seat's in Edinburgh? (6)

Ross

I believe the answer is:

arthur

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'old king' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for arthur that I've seen before include "Greed" , "Old king" , "- - Lowe (actor)" , ""The once and future king"" , "Round Table king" .)

I've seen this clue in The Telegraph.
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