Tried mightily (6)
I believe the answer is:
strove
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tried mightily</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for strove that I've seen before include "Voters (anag) - made every effort" , "Made great efforts" , "Endeavoured" , "Struggled" , "Tried hard for voters" .)