Shrivel up (7)
(Other definitions for crumple that I've seen before include "Collapse, cave in" , "wrinkle" , "Fold, collapse" , "Become crushed" , "Go to pieces" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shrivel up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that shrivel up can be written as wither)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for wither that I've seen before include "Shrivel and decay" , "Writhe about and shrivel" , "Waste" , "(Of a plant) shrivel up" , "Droop, shrivel" .)