Article on a brain disturbance from the Middle East (7)
I believe the answer is:
arabian
'from the middle east' is the definition.
'article on a brain disturbance' is the wordplay.
'article' becomes 'a' (indefinite article).
'on' means one lot of letters goes inside another (as in clothing \'on\' a person).
'disturbance' is an anagram indicator.
'brain' with letters rearranged gives 'rabin'.
'a' put inside 'rabin' is 'rabian'.
'a'+'rabian'='ARABIAN'
(Other definitions for arabian that I've seen before include "Type of horse" , "Middle Easterner; horse" , "Sea in the northwestern part of the Indian Ocean" , "Of a Middle East area" , "telling nights" .)