Crossword Genius

Very significant hater may emerge thus (5-10)

Ross

I believe the answer is:

earth-shattering

I'm a little stuck... Click here to teach me more about this clue!

'very significant' is the definition.
'earth shattering' can be an answer for 'significant' (similar in meaning). I am not certain of the 'very' bit.

'hater may emerge thus' is the wordplay.
I cannot quite see how this works, but
an anagram of 'hater' is 'earth' which is present in the answer.
The remaining letters 'shattering' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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