Shore where Alec is not swimming (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
coastline
(Other definitions for coastline that I've seen before include "Seaboard" , "Sectional (anag) - sea/land border" , "Outline of land from sea" , "Edge of a landmass" , "Perimeter of. eg. Britain" .)