Pennsylvania city on a Great Lake (4)
I believe the answer is:
erie
'pennsylvania city on a great lake' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for erie that I've seen before include "North american lake sounds spooky" , "N. American lake" , "One of the Great Lakes" , "Great lake in Eire" , "Spooky-sounding" .)