One of the Stones that rocks (5)

I believe the answer is:

logan

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'one of the stones that rocks' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for logan that I've seen before include "Rocking-stone" , "Mount ..... is the highest peak in Canada" , "(Grower of) berry" , "Rocking stone" .)

I've seen this clue in The Globe and Mail.

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