American subject receiving British honour from Scottish king (7)

I believe the answer is:

macbeth

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'scottish king' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for macbeth that I've seen before include "King of Scotland, 1040-1057" , "Shakespearean play" , "play with tragic results" , "Shakespearean tragedy" , "Shakespears's Scottish play" .)

I've seen this clue in The Independent.

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