Top story in America? (5)

I believe the answer is:

attic

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'top story' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for attic that I've seen before include "Ancient Greek; loft" , "where high-ups are found?" , "Loft room" , "Room inside a building's roof space" , "Top chamber" .)

I've seen this clue in The Sun and The Times.

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