The capital of Turkey (6)
I believe the answer is:
ankara
'the capital of turkey' is the definition.
('Ankara' can be a synonym of 'capital of turkey')
This is the entire clue.
(Other definitions for ankara that I've seen before include "Turkey's capital" , "Turkish city" , "Capital of 8 across" , "Turkish capital" , "Capital established by Ataturk" .)