Justifies relocating precarious sites from slopes of dormant volcano (4)

I believe the answer is:

fuji

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'volcano' is the definition.
(I have seen 'Japanese volcano ' mean 'fuji' so perhaps 'volcano' could also mean 'fuji')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fuji that I've seen before include "Sacred volcano of Japan" , "Mount of Japan" , "Japanese mount" , "Extinct Japanese volcano - cherry tree" , "Japanese holy mountain" .)

I've seen this clue in The Irish Times.

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