Indian city featured in not very intelligent plan (7)
I believe the answer is:
diagram
'plan' is the definition.
(I've seen this before)
'indian city featured in not very intelligent' is the wordplay.
'indian city' becomes 'agra' (I've seen this before).
'featured in' is an insertion indicator.
'not very intelligent' becomes 'dim'.
'agra' inserted within 'dim' is 'DIAGRAM'.
(Other definitions for diagram that I've seen before include "Outline drawing showing parts or workings" , "Explanatory drawing or plan" , "Chart" , "Drawing to show how things work" , "I'm a drag (anag)" .)