Hidden store (5)
I believe the answer is:
cache
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hidden store</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cache that I've seen before include "Stockpile" , "(Place in) hidden store" , "Put away" , "Hidden storage place" , "Secret store, hoard" .)