Seine city (5)
I believe the answer is:
paris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seine city</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 paris that I've seen before include "I spar (anag)" , "Helen's abductor" , "foreign city" , "European capital -- Trojan prince" , "French city" .)