Utter, express (5)
I believe the answer is:
voice
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">utter</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(voicing is a kind of uttering)</span><br/ ><br/ >'<span class="explanation-format__original">express</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(voicing is a kind of expressing)</span><br/ ><br/ ></span>
(Other definitions for voice that I've seen before include "Sound of speaker" , "Sound produced in speaking" , "Articulate" , "Ability to speak, sing" , "Spoken sound" .)