Buffalo's lake (4)
I believe the answer is:
erie
'buffalo's lake' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for erie that I've seen before include "Lake between Canada and the US" , "Great lake in Eire" , "North american lake sounds spooky" , "A Great American lake - sounds spooky" , "Superior companion" .)