Security worker (5)
I believe the answer is:
guard
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">security worker</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 guard that I've seen before include "Sentry" , "state of caution" , "Protection" , "See 1" , "Yeomen" .)