Oddly able to leave one country for another (7)
I believe the answer is:
austria
'oddly able to leave one' is the definition.
I can't tell whether this definition defines the answer.
'country for another' is the wordplay.
I cannot really see how this works, but
'country' could be 'us' (US is an example) and 'us' is found within the answer.
The remaining letters 'atria' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for austria that I've seen before include "Republic of central Europe" , "EU country" , "Mountainous European state" , "Capital city is Vienna" , "Us tiara found in a European state" .)