Stir anarchy within capital city (6)
I believe the answer is:
tirana
'capital city' is the definition.
(I've seen this before)
'stir anarchy within' is the wordplay.
'within' indicates a hidden word.
'TIRANA' is hidden within 'stir anarchy'.
(Other definitions for tirana that I've seen before include "Albanian capital" , "Take a train to Albania's capital (6)" , "capital city" , "Take a train to the capital of Albania" , "foreign capital" .)