Acquisition by staff involved in corruption (10)
I believe the answer is:
attainment
'acquisition' is the definition.
(I know that acquisition can be written as attainment)
'staff involved in corruption' is the wordplay.
'staff' becomes 'men' (I've seen this in other clues).
'involved in' indicates putting letters inside.
'corruption' becomes 'attaint' (I am not sure about this - if you are sure you should believe this answer much more).
'men' inserted inside 'attaint' is 'ATTAINMENT'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for attainment that I've seen before include "Realisation" , "Feat achieved" , "Laudable exploit" , "Act of achieving something" , "The achievement (of a goal)" .)