Freewheel (5)
I believe the answer is:
coast
'freewheel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for coast that I've seen before include "Move effortlessly" , "Freewheel - seashore" , "Seaside - freewheel" , "Where the land and sea meet" , "(Of car) move without power" .)