Taj Mahal's city (4)
I believe the answer is:
agra
'taj mahal's city' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for agra that I've seen before include "Site of the TajMahal" , "Subcontinental city" , "Home to the Taj Mahal" , "city founded in 1566" , "City in India" .)