Officialdom requires extremely rare draft copy (3,4)
I believe the answer is:
red tape
'officialdom' is the definition.
(I've seen this before)
'extremely rare draft copy' is the wordplay.
'extremely' suggests removing the centre.
'draft' becomes 'dt' (I can't explain this - if you can you should believe this answer much more).
'copy' becomes 'ape' (synonyms).
'rare' with its centre removed is 're'.
're'+'dt'+'ape'='RED-TAPE'
'requires' acts as a link.
(Other definitions for red tape that I've seen before include "Excessive bureaucracy (3.4)" , "officialdom" , "Intricate official routine" , "bureaucratic snarl-up?" , "Bureaucratic papers and routines" .)