Raw material from Korea (3)
I believe the answer is:
ore
'raw material' is the definition.
'from korea' is the wordplay.
'from' indicates a hidden word.
'ORE' is hidden in the letters of 'korea'.
(Other definitions for ore that I've seen before include "not worth a lot to Danes" , "Danish currency" , "Small coins" , "tangle" , "Unwrought iron" .)