France's longest river (5)
I believe the answer is:
loire
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">france's longest river</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 loire that I've seen before include "flower abroad" , "Longest French river" , "flower found amid vineyards" , "French department" , "department in France" .)