Solemnly renounce (6)
I believe the answer is:
abjure
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">solemnly renounce</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 abjure that I've seen before include "Renounce, forswear" , "Reject" , "Forswear, recant" , "(Solemnly) give up" , "Disavow" .)