What Canute said to the ocean in some remote spot? (9)
I believe the answer is:
backwater
'spot?' is the definition.
(I have seen 'Isolated spot' mean 'backwater' so perhaps 'spot' could also mean 'backwater')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for backwater that I've seen before include "Place where no development happens" , "Stagnant part of a river" , "Isolated place" , "in the sticks" , "place of inactivity" .)