Crossword Genius

Bureaucrat in enclosure with dealer (3,6)

Ross

I believe the answer is:

pen pusher

I'm a little stuck... Click here to teach me more about this clue!

'bureaucrat' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'enclosure with dealer' is the wordplay.
'enclosure' becomes 'pen' (pen is a kind of enclosure).
'with' says to put letters next to each other.
'dealer' becomes 'pusher' (I can't explain this - if you can you should give a lot more credence to this answer).
'pen'+'pusher'='PEN-PUSHER'

'in' is the link.

Can you help me to learn more?

(Other definitions for pen pusher that I've seen before include "Clerk" , "clerical worker" , "cog in office?" .)

I've seen this clue in The Daily Express.
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