Plan isn't clear about Indian city (7)
I believe the answer is:
diagram
'plan' is the definition.
(I've seen this in another clue)
'isn't clear about indian city' is the wordplay.
'isn't clear' becomes 'dim' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' is an insertion indicator.
'indian city' becomes 'agra' (city in India).
'dim' enclosing 'agra' is 'DIAGRAM'.
Can you help me to learn more?
(Other definitions for diagram that I've seen before include "I'm a drag (anag)" , "Chart" , "Schematic representation" , "A grid, Ma? (Anag)" , "Explanatory figure" .)