Dad's lover found at address in Salem, an Indian city? (6)

I believe the answer is:

mumbai

I'm a little stuck... Click here to teach me more about this clue!

'indian city?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for mumbai that I've seen before include "Indian city formerly known as 4" , "School bag" , "Formerly Bombay" , "New name for Bombay" , "place in India" .)

I've seen this clue in the Irish Times.

Want a hint initially instead of a full solution? Install my app