Proved (12)
I believe the answer is:
demonstrated
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">proved</span>' is the definition.<br/ ><span class="explanation-format__explanation">('demonstrate' can be a synonym of 'prove')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for demonstrated that I've seen before include "made public protest" , "shown up" .)