In Pakistan Karachi is an Asian capital (6)
I believe the answer is:
ankara
'an asian capital' is the definition.
(capital of Turkey)
'in pakistan karachi is' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ANKARA' can be found hidden inside 'pakistan karachi is'.
(Other definitions for ankara that I've seen before include "Capital of Turkey" , "Capital city" , "European capital" , "Turkey's capital" , "Turkish city" .)