Critical moment? (6)
I believe the answer is:
crunch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">critical moment?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crunch that I've seen before include "Informally, a decisive event or showdown" , "moment of difficulty" , "Bite noisily - moment of decision" , "Decisive moment" , "Crush noisily" .)