A northern vault is approaching extremes of threats from those promoting disaster (10)

I believe the answer is:

anarchists

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'threats from those promoting disaster' is the definition.
I can't tell whether this definition defines the answer.

'a northern vault is approaching extremes' is the wordplay.
'a northern vault' becomes 'anarch' (I can't justify this - if you can you should give a lot more credence to this answer).
'approaching' becomes 'towards' (I've seen this before).
'extremes' says to hollow out the word (remove centre letters).
'towards' with its centre removed is 'ts'.
'anarch'+'is'+'ts'='ANARCHISTS'

'of' is the link.

Can you help me to learn more?

(Another definition for anarchists that I've seen is " revolutionaries".)

I've seen this clue in the Sydney Morning Herald.

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