Resort, possibly, to be seen in a poster (7)
I believe the answer is:
seaport
'resort' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'to be seen in a poster' is the wordplay.
'a poster' anagrams to 'SEAPORT'.
But, I'm not clear how the anagram is indicated.
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for seaport that I've seen before include "Lisbon, for example" , "Town with deep-water harbour" , "Dover, say" , "Place with harbour for ocean-going ships" , "Coastal town with harbour" .)