__ Court, the regulator of heraldry in Scotland (4)

I believe the answer is:

lyon

(Other definitions for lyon that I've seen before include "River port of southeast France" , "City where the Saone joins the Rhone" , "French city on the Rhone" , "River port, capital of the Rhone department" , "Southern French city" .)

I've seen this clue in The Guardian.

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