Folder holder (4)
I believe the answer is:
file
'folder holder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for file that I've seen before include "Folder; rasp" , "Dossier; line of people" , "Dosssier" , "Set of related records kept together" , "Smoothing tool - orderly batch of documents" .)