Winding more, sank disastrously? That's right!

I believe the answer is:

snakier

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'winding more sank disastrously? that's right' is the definition.
I can't tell whether this definition defines the answer.

'sank disastrously? that's right' is the wordplay.
'disastrously?' indicates anagramming the letters (I've seen this in other clues).
'that's' becomes 'ie'.
'right' becomes 'r' (common abbreviation).
'sank' is an anagram of 'snak'.
'snak'+'ie'+'r'='SNAKIER'

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

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