Did battle (6)
I believe the answer is:
fought
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">did battle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fought that I've seen before include "Made a strenuous or laboured effort" , "Had a row" , "Scrapped" , "Quarrelled" , "Through the courts opposed" .)