Study of speech sounds (9)
I believe the answer is:
phonetics
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">study of speech sounds</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 phonetics that I've seen before include "Study of speech sounds" , "Science of speech sounds" , "Branch of knowledge concerned with speech sounds" .)