Revealing (7)
I believe the answer is:
telling
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">revealing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that telling is a type of revealing)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for telling that I've seen before include "Giving an order" , "Counting" , "Powerful - effective" , "Revealing, significant" , "relation" .)