Broken toe's in a cast here (7)
I believe the answer is:
estonia
'cast here' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'broken toe's in a' is the wordplay.
'broken' indicates an anagram.
'toes'+'in'='toesin'
'toesin' is an anagram of 'estoni'.
'estoni'+'a'='ESTONIA'
Can you help me to learn more?
(Other definitions for estonia that I've seen before include "Northern European country" , "So eat in here in Eastern Europe" , "Republic in northeastern Europe" , "One of the Baltic States" , "Baltic state" .)