Some pretty, rolling countryside in Austria (5)
I believe the answer is:
tyrol
'in austria' is the definition.
('Tyrol' is part of 'austria')
'some pretty rolling countryside' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'TYROL' is hidden in the letters of 'pretty rolling countryside'.
(Other definitions for tyrol that I've seen before include "Austrian Alpine state (English spelling)" , "mountain state" , "ski region" , "Gustav ---, symphonist" , "Austrian/Italian region" .)