Crossword Genius

Test case? (5)

Ross

I think it could be either:

final

trial

'test case?' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for trial that I've seen before include "Ordeal, perhaps in court" , "Ordeal or lawsuit" , "Legal proceedings or a test run" , "Troublesome thing; test" , "Test of suitability" .)

I've seen this clue in The Washington Post and The Daily Express.
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