A mixture with one left out — bad luck (9)

I believe the answer is:

adversity

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'bad luck' is the definition.
(adversity is a kind of bad luck)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for adversity that I've seen before include "Misfortune, hardship" , "Hard times or misfortune" , "State of misfortune or affliction" , "Circumstances that cause trouble or sorrow" .)

I've seen this clue in The Times.

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