Chambers describing one country and another (7)
I believe the answer is:
austria
'and another' is the definition.
I can't judge whether this definition defines the answer.
'chambers describing one country' is the wordplay.
'chambers' becomes 'atria' (atrium is a kind of chamber).
'describing' means one lot of letters goes inside another (describe can mean to form the outline of).
'one country' becomes 'us' (U.S. is an example).
'atria' enclosing 'us' is 'AUSTRIA'.
Can you help me to learn more?
(Other definitions for austria that I've seen before include "EU member" , "Mountainous European republic" , "The capital is Vienna (7)" , "European nation" , "Republic of central Europe" .)