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Chart mapping out twelve houses (6)


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'chart' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for zodiac that I've seen before include "Heavenly belt with 12 signs" , "astrological study" , "Houses seen on a cycle" , "Imaginary belt of heavenly signs" , "Heavenly area" .)

I've seen this clue in The Telegraph.
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