Mal de mer (11)
I believe the answer is:
seasickness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mal de mer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for seasickness that I've seen before include "Mal de mer" , "Marine nausea" .)