The ways of revenue officials (7)
I believe the answer is:
customs
'the ways' is the definition.
(I have seen 'Traditional ways' mean 'customs' so perhaps 'ways' could also mean 'customs')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for customs that I've seen before include "Accepted practices" , "Import/export duties" , "state's duties?" , "Traditional ways" , "Import duties" .)