Stick up for (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stick up for</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 defend that I've seen before include "Guard against attack" , "Maintain against attack" , "Protect - endorse" , "Help or protect against attack" , "Block, as in cricket" .)