Communal (6)
'communal' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for public that I've seen before include "Offence against common decency" , "In open view" , "Unconcealed" , "Community in the open?" , "Open to everyone" .)
(Other definitions for social that I've seen before include "Relating to people living in groups" , "Official helping families with problems" , "Relating to humans living together in large groups" , "Gregarious; a party" , "Needing companionship" .)