Left a wife with set of clothes in case (7)

I believe the answer is:

lawsuit

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'case' is the definition.
(I know that case can be written as lawsuit)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lawsuit that I've seen before include "Dispute brought to court" , "Process of bringing dispute or claim before the courts" , "Court case" , "Legal proceedings" , "The process of bringing action in legal court" .)

I've seen this clue in The Sun and The Times.

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