Watchfulness (9)
(Other definitions for vigilance that I've seen before include "Keeping careful watch on" , "Alertness, watchfulness" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">watchfulness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alertness that I've seen before include "Wakeful characteristic" , "Showing attentive nature" , "It's needed to respond quickly to danger" , "Watchful state" , "State of vigilance and watchfulness" .)