Crossword Genius

Means of progress by learning from one’s mistakes (5,3,5)

Ross

I believe the answer is:

trial and error

(Other definitions for trial and error that I've seen before include "Empirical route to solution" , "Empirical procedure" , "Experimental process" , "One needs a means of finding the truth" , "Testing method" .)

I've seen this clue in The Times.
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