Copier puncturing edges of precious documents (6)
I believe the answer is:
papers
'documents' is the definition.
(I've seen this in another clue)
'copier puncturing edges of precious' is the wordplay.
'copier' becomes 'aper' (ape can mean to copy or imitate).
'puncturing' indicates putting letters inside (I've seen this in other clues).
'edges of' means to remove the middle letters.
'precious' with its centre taken out is 'ps'.
'aper' placed inside 'ps' is 'PAPERS'.
(Other definitions for papers that I've seen before include "ID etc." , "Documentation" , "Print media" , "Documents; the press" , "tabloids, maybe" .)