Crossword Genius

Make an accurate plan of PM’s residence (9)

Ross

I believe the answer is:

chartwell

'pm's residence' is the definition.
(home of Winston Churchill)

I don't understand the rest of the clue.

(Other definitions for chartwell that I've seen before include "Winston Churchill's Kent home" , "Churchill's place?" .)

I've seen this clue in The Times.
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