Lisbon's river (5)
I believe the answer is:
tagus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lisbon's river</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tagus that I've seen before include "waterway" , "Portugese river" , "river flowing to Atlantic" , "banker" , "river abroad" .)