Somme city (6)
I believe the answer is:
amiens
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">somme 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 amiens that I've seen before include "European town" , "City in northern France" , "capital of Picardy" , "French town" , "City of NE France" .)