Disproved (7)
I believe the answer is:
refuted
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disproved</span>' is the definition.<br/ ><span class="explanation-format__explanation">('refute' can be a synonym of 'disprove')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for refuted that I've seen before include "Proved (a statement) to be wrong" , "Negated" , "Denied" , "Disproved" , "Proved false" .)