Evaluate, as ore (5)
I believe the answer is:
assay
'evaluate as ore' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for assay that I've seen before include "Test ore for value" , "Test quality of ore" , "Examine chemicals" , "Examine (ore or alloy?)" , "'Analyse, precious metal, say (5)'" .)