Lobbies for yes perhaps (6)
I believe the answer is:
foyers
'lobbies' is the definition.
('foyer' can be a synonym of 'lobby')
'for yes perhaps' is the wordplay.
'perhaps' indicates an anagram.
'for'+'yes'='foryes'
'foryes' with letters rearranged gives 'FOYERS'.
(Other definitions for foyers that I've seen before include "Entry halls to theatres or cinemas" , "Lobbies" , "Entrance halls to theatres" , "Entry areas to theatres" , "Entrance areas in theatres" .)