Day before an event (3)
I believe the answer is:
eve
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">day before an event</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eve that I've seen before include "Previous day" , "First mate" , "Night before an event" , "She reportedly lived first" , "The night before a festival" .)