Walk beside the seaside? (9)

I believe the answer is:

esplanade

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'walk' is the definition.
(I know that esplanade is a type of Promenade)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for esplanade that I've seen before include "Seaside road" , "front" , "Long level area for walking beside the sea" , "Seaside walkway" , "Paved area at seaside resort" .)

I've seen this clue in The Telegraph.

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