Pieces added to the end (7)
I believe the answer is:
addenda
'pieces added to the end' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for addenda that I've seen before include "Extra items put in book" , "Postscripts, supplements" , "collection of extra material" , "Items added to a text" , "Additions to documents" .)