Area between the Urals and the Pacific (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
(Other definitions for siberia that I've seen before include "Russia's far east" , "'Region of Russia, famous for its long, cold winters (7)'" , "chosen by Putin for no-frills travel?" , "Former place of exile for a Russian" , "Cold area" .)