Crossword Genius

He’s familiar with a south part of London (3)

Ross

I believe the answer is:

ken

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'he's' is the definition.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ken that I've seen before include "Understanding - boy's name" , "Notice" , "Know; man's name" , "Awareness" , "Identify; -- Livingstone" .)

I've seen this clue in the Evening Standard.
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