Go to bat for
I believe the answer is:
defend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go to bat for</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 defend that I've seen before include "Protect from harm" , "Protect against challenge or attack" , "Guard against attack" , "Protect or assist against attack" , "Protect, fight back" .)