Crossword Genius

Blackish seaside structure? (5)

Ross

I believe the answer is:

jetty

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'blackish seaside' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'structure?' is the second definition.
(I know that jetty is a type of architectural structure)

Can you help me to learn more?

(Other definitions for jetty that I've seen before include "Dock" , "Small landing stage" , "Wharf" , "Quay" , "Pier - landing stage" .)

I've seen this clue in the Evening Standard.
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