Cold Russian region (7)
I believe the answer is:
siberia
'cold russian region' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for siberia that I've seen before include "Area of eastern Russia" , "a place often very cold" , "Region in former USSR noted for harsh winters and notorious for prison camps" , "Russian region in N Asia noted for harsh winters and prison camps" , "Vast Asian region of Russia" .)