Fall in (8)
I believe the answer is:
collapse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fall in</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for collapse that I've seen before include "Slump" , "Founder" , "Break-down or complete failure" , "Faint and fall" , "Fall down suddenly like escallop" .)