Refine metal (5)
I believe the answer is:
smelt
'refine metal' 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 "Sniffed - fish" , "Inhaled odour" , "Small fish of salmon species" , "emitted noxious effluvium" , "Fish related to the salmon (which ponged?)" .)