Where Maria sings 'The Hills Are Alive' in 'The Sound of Music (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
meadow
(Other definitions for meadow that I've seen before include "Field used for hay" , "Hayfield" , "it's green here" , "Area used for hay" , "Tract of cultivated grassland" .)