Old revolutionary to question almost all the Treasury (9)
I believe the answer is:
exchequer
'treasury' is the definition.
(I know that treasury can be written as exchequer)
'old revolutionary to question almost all' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'revolutionary' becomes 'Che' (Che Guevara the Marxist revolutionary).
'to question' becomes 'qu' (abbreviation).
'almost all' becomes 'er' (I can't explain this - if you can you should believe this answer much more).
'ex'+'che'+'qu'+'er'='EXCHEQUER'
'the' is the link.
Can you help me to learn more?
(Other definitions for exchequer that I've seen before include "large supply of money" , "old government office" , "Government treasury department" , "Department in charge of a nation's finances" , "Government funding?" .)