First to arrive (8)
I believe the answer is:
earliest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">first to arrive</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 earliest that I've seen before include "Furthest back in time" , "Nearest the beginning in time" , "Soonest" , "Arriving first" , "Ateliers (anag.)" .)