Crossword Genius

A poster, possibly, for a coastal place? (7)

Ross

I believe the answer is:

seaport

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

'a coastal place?' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Maybe there's an association between them I don't understand?

'a poster possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'a'+'poster'='aposter'
'aposter' with letters rearranged gives 'SEAPORT'.

'for' is the link.

Can you help me to learn more?

(Other definitions for seaport that I've seen before include "Sydney perhaps" , "Lisbon, for example" , "place on the coast" , "Esparto (anag)" , "Southampton, say" .)

I've seen this clue in the Evening Standard.
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