In a courtly way, he's like a London Baron (4)

I believe the answer is:

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'baron' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for earl that I've seen before include "Countess his wife" , "Male member of British nobility" , "Rank immediately above viscount" , "British nobleman" , "Essex, say" .)

I've seen this clue in the Evening Standard.

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