Crossword Genius

A town in Meath around unique summit that's close to my heart? (6)

Ross

I believe the answer is:

atrium

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'heart?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for atrium that I've seen before include "Roofed courtyard" , "Roman courtyard" , "An upper chamber of the heart" , "An upper cavity in the heart" , "High central hall in large building" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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