Complete change (13)
I believe the answer is:
metamorphosis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">complete change</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for metamorphosis that I've seen before include "Complete change of appearance" , "Total change in character" , "changing?" , "Transmutation" , "Process of transformation" .)