Creepy-sounding lake (5)
I believe the answer is:
eerie
'creepy' is the definition.
(eerie can mean strange or creepy)
'sounding lake' is the wordplay.
'sounding' becomes 'e' (I've seen this in other clues).
'lake' becomes 'erie' (Lake Erie is one of the Canadian/US 'Great Lakes').
'e'+'erie'='EERIE'
(Other definitions for eerie that I've seen before include "Weird and disturbing" , "Uncannily strange" , "Strangely frightening" , "Spooky, creepy" , "Spectral" .)