Move effortlessly by the sea (5)
I believe the answer is:
coast
'move effortlessly' is the definition.
(coasting is a kind of moving effortlessly)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for coast that I've seen before include "float" , "Land beside the sea" , "Move easily without power" , "Land next to the sea" , "that goes all around the UK?" .)