Shallowest of the Great Lakes (4)
I believe the answer is:
erie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shallowest of the great lakes</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 erie that I've seen before include "Buffalo's lake" , "N. American lake" , "Lake between Canada and the US" , "Great lake in Eire" , "Superior companion" .)