Document storage unit (6,7)
I believe the answer is:
filing cabinet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">document storage unit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for filing cabinet that I've seen before include "Item of office furniture" , "Piece of furniture containing documents" , "Where documents are found" , "Traditional receptacle for written data" , "Document storage unit" .)