Raw material from forest (3)
I believe the answer is:
ore
'raw material' is the definition.
(I've seen this in another clue)
'from forest' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ORE' is hidden in the letters of 'forest'.
(Other definitions for ore that I've seen before include "Small coins" , "foreign money" , "coinage" , "Mined material" , "Raw mineral" .)