Rolling down to the sea? (8)

I believe the answer is:

coasting

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'rolling' is the definition.
The answer and definition can be both to do with motion as well as being present participle verbs.
Perhaps you can see an association between them that I can't see?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for coasting that I've seen before include "Just rolling along with agnostic" , "Not trying all that hard" , "Agnostic (anag) -- moving easily" .)

I've seen this clue in the Evening Standard.

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