Fuse ore (5)
I believe the answer is:
smelt
'fuse 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 "Stank" , "sensed as fishy?" , "was whiffy" , "Extract metal from twenty two" , "18 [EXTRACT] metal" .)