Separate metal sensed (5)
I believe the answer is:
smelt
I believe this is a double definition.
'separate metal' is the first definition.
(smelting means separating a metal out from an ore)
'sensed' is the second definition.
(smelling is a sense)
(Other definitions for smelt that I've seen before include "emitted noxious effluvium" , "half a guinea" , "Food fish often fried" , "Arab leader" , "Extract metal from ore, fish" .)