Turkish commander crossing river in Indian city (4)
I believe the answer is:
agra
'indian city' is the definition.
(I've seen this before)
'turkish commander crossing river' is the wordplay.
'turkish commander' becomes 'aga' (I've seen this before**).
'crossing' indicates putting letters inside.
'river' becomes 'r'.
'aga' enclosing 'r' is 'AGRA'.
'in' acts as a link.
(Other definitions for agra that I've seen before include "Not tight" , "Foreign city" , "Eastern city" , "Indian city, capital of the Mogul empire until 1658" , "city founded in 1566" .)