Imprison drug dealer doing paperwork (9)
I believe the answer is:
penpusher
'doing paperwork' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'imprison drug dealer' is the wordplay.
'imprison' becomes 'pen' (to pen in is to imprison).
'drug dealer' becomes 'pusher' (someone who sells or pushes drugs).
'pen'+'pusher'='PENPUSHER'
Can you help me to learn more?
(Other definitions for penpusher that I've seen before include "Bored clerk" , "Clerical worker with a boring job" , "Clerical worker with a tedious job" , "Hen supper for an old scribe or lowly clerk" .)