Bandido-cum-entertainer conceals record (8)
I believe the answer is:
document
'record' is the definition.
(documenting is a kind of recording)
'bandido-cum-entertainer conceals' is the wordplay.
'conceals' says the answer is hidden in the clue.
'DOCUMENT' can be found hidden inside 'bandido cum entertainer'.
(Other definitions for document that I've seen before include "Piece of written matter" , "Piece of writing, of an official nature perhaps" , "Paper, form" , "Will, for example" , "Official paper" .)