Refine ore (5)
I believe the answer is:
smelt
'refine ore' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for smelt that I've seen before include "Small fish of salmon species" , "Inhaled odour" , "sensed as fishy?" , "half a guinea" , "18 [EXTRACT] metal" .)