Ethnic region mostly Turkish - and fractured (9)
I believe the answer is:
kurdistan
'ethnic region' is the definition.
The definition suggests a singular noun which matches the answer.
'mostly turkish and fractured' is the wordplay.
'mostly' means to remove the last letter (most but not all of the word).
'fractured' indicates an anagram.
'turkish' with its final letter taken off is 'turkis'.
'turkis'+'and'='turkisand'
'turkisand' with letters rearranged gives 'KURDISTAN'.
Can you help me to learn more?
(Another definition for kurdistan that I've seen is " province".)