Protect from attack (6)
I believe the answer is:
defend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">protect from attack</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for defend that I've seen before include "Block, as in cricket" , "Protect from harm" , "Represent the accused" , "Protect - guard" , "Maintain against attack" .)