Crossword Genius

TWL's V: that with Hades swirling around below (4,3,7,4)

Ross

I believe the answer is:

what the thunder said

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'twl's v' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'that with hades swirling around below' is the wordplay.
I cannot really understand how this works, but
an anagram of 'that' is 'hatt' which is located in the answer.
'with' could be 'w' (short for with) and 'w' is found within the answer.
'below' could be 'under' (synonyms) and 'under' is present in the answer.
This explanation may well be incorrect...

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