Usher in (9)
I believe the answer is:
introduce
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">usher in</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for introduce that I've seen before include "Inaugurate, initiate" , "To add" , "Present, make known" , "Bring in something or someone new" , "Present (someone) by name" .)