Accumulated wealth in chief city (7)
I believe the answer is:
capital
I believe this is a double definition.
'accumulated wealth' is the first definition.
(I've seen this in another clue)
'chief city' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for capital that I've seen before include "Upper-case letter" , "liquid assets" , "Principal city" , "Means" , "It's excellent in the big city" .)