International artificial language (9)
I believe the answer is:
esperanto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">international artificial language</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for esperanto that I've seen before include "special speech" , "contrived language" , "Language invented by Dr Zamenhof" , "Dr Zamenhof's language" , "common language" .)