In safe custody (6)
I believe the answer is:
secure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in safe custody</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for secure that I've seen before include "Safe, protected" , "Safe against attack or well fastened" , "Obtain - safe" , "Firmly in place - free from danger" , "Safe; fixed" .)