Posh, like some gases? (5)
I believe the answer is:
noble
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">posh</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">like some gases?</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for noble that I've seen before include "like Basie or Ellington?" , "gold coin, now obsolete" , "Person of high rank" , "Maybe count" , "eg Earl" .)