Some pretty, rolling territory in Europe (5)
I believe the answer is:
tyrol
'in europe' is the definition.
('Tyrol' is part of 'europe')
'some pretty rolling territory' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'TYROL' is hidden in the letters of 'pretty rolling territory'.
(Other definitions for tyrol that I've seen before include "hills here" , "Austrian province" , "Austrian Alpine state (English spelling)" , "ski region" , "Alpine district of Austria and Italy" .)