Tribunal threw out cake lawsuit (5)

I believe the answer is:

trial

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'lawsuit' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for trial that I've seen before include "Test of suitability" , "Court appearance on charge - it's an ordeal" , "Ordeal or lawsuit" , "Test to determine guilt or innocence" , "Judicial examination" .)

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

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