Language expert (8)
I believe the answer is:
linguist
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">language expert</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for linguist that I've seen before include "Person proficient in languages" , "He speaks in tongues" , "One proficient in languages" , "Polyglot" , "is speaking in tongues" .)