National treasury (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
exchequer
'national treasury' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for exchequer that I've seen before include "royal treasury" , "Purse" , "government section" , "large supply of money" , "National treasury" .)