Folder (4)
(Other definitions for binder that I've seen before include "Cover for loose sheets of paper" , "worker in Morocco" , "Holder for magazines" , "Cover for holding loose papers together" , "One that secures" .)
(Other definitions for spam that I've seen before include "Tinned processed meat" , "net on junk? On the contrary" , "Junk emails" , "Thoughtlessly send" , "luncheon meat" .)
'folder' is the definition.
(file folder is a kind of folder)
This is the entire clue.
(Other definitions for file that I've seen before include "Line on board" , "Folder; line" , "(Set of) documents- line" , "Three Dn and this can indicate ordinary people" , "Tool for sawing through metal" .)