Bend the knee (5)
I believe the answer is:
kneel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bend the knee</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for kneel that I've seen before include "Get down to be knighted" , "Rest in prayer" , "Crouch down" , "Prepare for prayer?" , "Go down on bended legs" .)