Ocean liner popular with sunbathers (8)

I believe the answer is:

seashore

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'popular with sunbathers' is the definition.
I can't judge whether this defines the answer.

'ocean liner' is the wordplay.
'ocean' becomes 'sea' (synonyms).
'liner' becomes 'shore' (I am not sure about this - if you are sure you should believe this answer much more).
'sea'+'shore'='SEASHORE'

Can you help me to learn more?

(Other definitions for seashore that I've seen before include "Coast, of an ocean say" , "Littoral" , "She sells seashells on it" , "Coastal land's edge" , "Strand, beach" .)

I've seen this clue in The Globe and Mail.

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