Most intense moment (6)
I believe the answer is:
climax
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most intense moment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for climax that I've seen before include "The decisive moment, in a novel or play say" , "Most exciting point" , "Peak of emotion" , "Exciting conclusion" , "exciting finale" .)