Said to be the same as a jetty (4)

I believe the answer is:

pier

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'jetty' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for pier that I've seen before include "sight at the seaside" , "Wharf or pillar" , "Platform out to sea" , "A landing stage or promenade" , "Structure with a deck, built over water" .)

I've seen this clue in the Evening Standard.

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