Root for (5)
I believe the answer is:
cheer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">root 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 cheer that I've seen before include "Jolly" , "Buck up" , "Applaud vocally, hurray etc" , "Give comfort or support to" , "Vocal sound of applause" .)