Calm, showing little emotion (6)
I believe the answer is:
stolid
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">calm</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">showing little emotion</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for stolid that I've seen before include "Not excitable, unemotional" , "cool" , "Impassive or apathetic" , "Bovine" , "Calm, unanimated" .)