Poem about open country, also a drink (9)
I believe the answer is:
orangeade
'drink' is the definition.
(I know that orangeade is a type of ade)
'poem about open country also a' is the wordplay.
'poem' becomes 'ode' (ode is a kind of poem).
'about' indicates putting letters inside.
'open country also' becomes 'range' (I am not sure about this - if you are sure you should believe this answer much more).
'range'+'a'='rangea'
'ode' placed around 'rangea' is 'ORANGEADE'.
Can you help me to learn more?
(Other definitions for orangeade that I've seen before include "Soft citrus drink" , "Fruit drink" , "Squash" , "Pop" , "Fruity drink" .)