Not at risk (4)
I believe the answer is:
safe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not at risk</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 safe that I've seen before include "Secure - place to keep cash" , "Metal box for security" , "Cash-box" , "Strongbox; secure" , "Secure cupboard" .)