Before all others (5)
I believe the answer is:
first
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">before all others</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for first that I've seen before include "Most important" , "second to none" , "Preceding all others" , "Earliest; good degree" , "& 2 Early new year arrivals bringing good luck" .)