Extract metal from (5)
I believe the answer is:
smelt
'extract metal from' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for smelt that I've seen before include "Savoured" , "was off, we may deduce?" , "Fish related to the salmon (which ponged?)" , "humming" , "half a guinea" .)