Bore witness (to) (8)
I believe the answer is:
attested
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bore witness to</span>' is the definition.<br/ ><span class="explanation-format__explanation">(attesting is a kind of bearing witness to)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for attested that I've seen before include "Witnessed formally" , "Bore witness to" , "Affirmed by oath" , "Claimed" , "Certified, vouched" .)