Storage site (5)
I believe the answer is:
depot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">storage site</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 depot that I've seen before include "Storehouse as for supplies" , "Bus garage" , "Bus station or warehouse" , "storeroom" , "Bus station in the US" .)