Held in reserve (6)
I believe the answer is:
stored
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">held in reserve</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stored that I've seen before include "Stashed away" , "Squirrelled away" , "Warehoused" , "Saved up in Dorset" , "Kept for future use, as in warehouse" .)