Bored with raw material (3)
I believe the answer is:
ore
'raw material' is the definition.
(I've seen this before)
'bored with' is the wordplay.
'with' says the answer is hidden in the clue.
'ORE' is hidden in the letters of 'bored'.
(Other definitions for ore that I've seen before include "Unwrought iron" , "Raw iron" , "Mined material" , "Rock from which metal is extracted" , "Metal-bearing rock or mineral" .)