Two refineries taking in raw material (3)
I believe the answer is:
ore
'raw material' is the definition.
(I've seen this in another clue)
'two refineries taking' is the wordplay.
'taking' indicates the answer is hidden within the clue (the answer is carried or taken by the clue).
'ORE' is hidden within 'two refineries'.
'in' acts as a link.
(Other definitions for ore that I've seen before include "15 down earth" , "foreign money" , "Mineral aggregate" , "Naturally occurring mineral" , "Mined material" .)