Sapper's new identity documents? (6)
I believe the answer is:
papers
'identity documents?' is the definition.
(I've seen this in another clue)
'sapper's new' is the wordplay.
'new' indicates anagramming the letters.
'sapper' is an anagram of 'PAPERS'.
(Other definitions for papers that I've seen before include "Documentation" , "ID etc." , "Print media" , "Identifying documents" , "Documents; the press" .)