For one single day turning to face nameless severe misfortune (8)

I believe the answer is:

disaster

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'misfortune' is the definition.
(I know that disaster is a type of adversity)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for disaster that I've seen before include "terrible trouble" , "awful situation" , "Catastrophic occurrence" , "Catastrophe, tragedy" , "Terrible calamity" .)

I've seen this clue in The Times.

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