Hanoi aided revolution? That's news to me (1,3,2,4)

I believe the answer is:

i had no idea

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'news to me' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'hanoi aided revolution?' is the wordplay.
'revolution?' indicates anagramming the letters (I've seen 'revolution' mean this).
'hanoi'+'aided'='hanoiaided'
'hanoiaided' with letters rearranged gives 'I HAD NO IDEA'.

'that's' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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