Hung out in posh style (7)
I believe the answer is:
resided
'hung out in posh style' is the definition.
The answer and definition can be both to do with fundamental existence as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for resided that I've seen before include "Dwelt" , "Sojourned" , "Lived" , "Settled" , "Abode" .)