Crossword Genius

Conclusive examination (4,4)

Ross

I believe the answer is:

acid test

'conclusive examination' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for acid test that I've seen before include "Validity confirmed" , "Conclusive moment (using litmus paper?)" , "Rigorous or crucial appraisal" , "crucial trial" , "Conclusive proof" .)

I've seen this clue in The Mirror.
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