Inauguration ceremony (4)
I believe the answer is:
oath
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inauguration ceremony</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oath that I've seen before include "swearing" , "A curse or solemn declaration" , "gadzooks!" , "'Profane, or solemn expression (4)'" , "Profane or obscene expression" .)