Lake that feeds Niagara Falls (4)
I believe the answer is:
erie
'lake that feeds niagara falls' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for erie that I've seen before include "Lake between Canada and the US" , "N. American lake" , "One of the Great Lakes" , "The lake sounds weird" , "Spooky-sounding" .)