Shore where Alec is not swimming (9)

I believe the answer is:

coastline

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'shore' is the definition.
(I know that coastline is a type of shore)

I don't understand the remainder of the clue.

(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" .)

I've seen this clue in The Sun.

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