Prepare to pop the question (5)
I believe the answer is:
kneel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prepare to pop the question</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for kneel that I've seen before include "Assume humble posture" , "Go down on bended legs" , "Crouch down" , "Rest on hassock" , "Show obeisance" .)