Nautical side (3)
I believe the answer is:
lee
'nautical side' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lee that I've seen before include "Robert E. - - , US hero" , "Sheltered from the wind in Cork, perhaps" , "Commander of the Confederate States Army in the American Civil War" , "Area sheltered from the wind" , "Protection" .)