Kept for future use (6)
I believe the answer is:
stored
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kept for future use</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 stored that I've seen before include "Stashed away" , "Kept for future use, as in warehouse" , "Squirrelled away" , "Put away for future use" , "Saved up in Dorset" .)