Get on a soapbox (5)
I believe the answer is:
orate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">get on a soapbox</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 orate that I've seen before include "Make a lengthy speech" , "make speeches" , "Make a formal speech" , "Talk pompously" , "Speaker may" .)