A poster, possibly, for a coastal place? (7)
I believe the answer is:
seaport
'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" .)