Driest turnover is the most catastrophic (6)

I believe the answer is:

direst

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'the most catastrophic' is the definition.
I can't judge whether this defines the answer.

'driest turnover' is the wordplay.
'turnover' indicates anagramming the letters.
'driest' anagrammed gives 'DIREST'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for direst that I've seen before include "Most horrific" , "far from ideal" .)

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

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