Lake that sounds spooky (4)
I believe the answer is:
erie
'lake that sounds spooky' is the definition.
(I've seen this in another clue)
'sounds spooky' is the wordplay.
'sounds' shows a homophone (sound like).
'spooky' becomes 'eerie' (synonyms).
'eerie' is a homophone of 'ERIE'.
(Other definitions for erie that I've seen before include "North american lake sounds spooky" , "Superior companion" , "N. American lake" , "One of the Great Lakes" , "Spooky-sounding" .)