Gosh, it might be Lucan! (4)

I believe the answer is:

lord

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'lucan' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for lord that I've seen before include "10th" , "Titled nobleman" , "Member of Upper House" , "to be drunk?" , "Member of the aristocracy" .)

I've seen this clue in the Evening Standard.

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