Crossword Genius

Most shocking of places? (9)

Ross

I believe the answer is:

epicentre

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'most' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for epicentre that I've seen before include "Point directly above the focus of an earthquake" , "Focus of activity" , "Earthquake's point of focus" , "Shakiest point" , "where maximum damage may occur" .)

I've seen this clue in The Times.
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