Baghdad's river (6)
I believe the answer is:
tigris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">baghdad's river</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tigris that I've seen before include "running water" , "flower of Iraq" , "Baghdad's river" , "Great river flowing from Turkey through Iraq" , "Iraqi river" .)