Vestibules (7)
I believe the answer is:
lobbies
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vestibules</span>' is the definition.<br/ ><span class="explanation-format__explanation">('lobby' can be a synonym of 'vestibule')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lobbies that I've seen before include "First planet" , "Entrance halls or ante-rooms" , "Tries to influence minister, say" , "Mounts campaign to influence politicians" , "Large entrances or reception areas" .)