Centre admitting Boris sent back a lot of paperwork (5)

I believe the answer is:

bumph

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'a lot of paperwork' is the definition.
I can't tell whether this defines the answer.

'centre admitting boris sent back' is the wordplay.
'centre' becomes 'hub' (hub is a kind of centre).
'admitting' is an insertion indicator (admit can mean to welcome in or accept).
'boris' becomes 'PM' (prime minister Boris Johnson).
'sent back' says the letters should be written in reverse.
'hub' enclosing 'pm' is 'hpmub'.
'hpmub' back-to-front is 'BUMPH'.

Can you help me to learn more?

(Other definitions for bumph that I've seen before include "Papers" , "Boring documents and written information" .)

I've seen this clue in The Independent.

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