Seat of government (7)
I believe the answer is:
capital
'seat of government' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for capital that I've seen before include "A great city - that's fine" , "(Person's) wealth" , "What starts this clue" , "It's jolly good in the great city" , "Money saved or invested - seat of government" .)