Store up (5)
I believe the answer is:
amass
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">store up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for amass that I've seen before include "Be a compiler" , "Put together" , "Get together" , "run up?" , "Stockpile" .)