Doctor treated Kurd, an alcoholic (8)
I believe the answer is:
drunkard
'alcoholic' is the definition.
(I've seen this before)
'doctor treated kurd an' is the wordplay.
'doctor' becomes 'Dr' (abbreviation).
'treated' is an anagram indicator.
'kurd'+'an'='kurdan'
'kurdan' with letters rearranged gives 'unkard'.
'dr'+'unkard'='DRUNKARD'
(Other definitions for drunkard that I've seen before include "Sot, addicted drinker" , "Toper, sot, lush" , "boozer" , "One regularly intoxicated" , "Habitual inebriate" .)