Exchequer (8)
I believe the answer is:
treasury
'exchequer' is the definition.
(I know that exchequer can be written as treasury)
This is all the clue.
(Other definitions for treasury that I've seen before include "The funds of a state" , "Place where great valuables are stored" , "Government finance department" , "British Department of Finance" , "The funds available to government" .)