Crossword Genius

Test the quality of (a metal) (5)

Ross

I believe the answer is:

assay

(Other definitions for assay that I've seen before include "Test metal for quality" , "Test(ing) of a substance, such as precious metal" , "Test ore for value" , "Test quality of metals" , "Test ore for content" .)

I've seen this clue in The Times.
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