Smashing time by northern lake (5)
I believe the answer is:
huron
'lake' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for huron that I've seen before include "One of the Great Lakes of North America" , "Second largest of the Great Lakes" , "Great Lake" , "N. American lake" .)