Open-mouthed (5)
I believe the answer is:
agape
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">open-mouthed</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 agape that I've seen before include "Christian feast" , "the love of God!" , "love feast" , "showing disbelief" , "ecclesiastical feast" .)