Amulet of metal is manufactured (8)
I believe the answer is:
talisman
'amulet' is the definition.
('talisman' can be a synonym of 'amulet')
'of metal is manufactured' is the wordplay.
'of' indicates a hidden word.
'TALISMAN' is hidden in the letters of 'metal is manufactured'.
(Other definitions for talisman that I've seen before include "Object believed to protect wearer" , "It's thought to be a magical protection against evil or disease" , "Object with magical power" , "Stone thought to have magical powers" , "which is charming" .)