Plan of Winston's home not showing well (5)

I believe the answer is:

chart

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'plan' is the definition.
(I know that chart is a type of plan)

I don't understand the rest of the clue.

(Other definitions for chart that I've seen before include "[LOVE ME DO] became the first of many to ..." , "Visual display of information" , "what could be a pie" , "Marine map" , "Map to assist navigation by sea" .)

I've seen this clue in The Telegraph.

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