Tribunal threw out cake lawsuit (5)
I believe the answer is:
trial
'lawsuit' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(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" .)