Oratory (8)
I believe the answer is:
rhetoric
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oratory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(rhetoric is a kind of oratory)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rhetoric that I've seen before include "Impressive or exaggerated speech as in public" , "Art of using language for persuasion" , "Eloquent and persuasive language" , "Empty words?" , "Art of effective speaking" .)