Crossword Genius

Conclusive decider (4,4)

Ross

I believe the answer is:

acid test

(Other definitions for acid test that I've seen before include "Conclusive moment (using litmus paper?)" , "A severe or conclusive exam or trial" , "Cat's diet (anag.)" , "Ultimate proof" , "Severe trial; old assay method" .)

I've seen this clue in The Times.
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