Reception area for you inside (5)
I believe the answer is:
'reception area' is the definition.
(I've seen this before)
'for you inside' is the wordplay.
'you' becomes 'ye' (historical version of 'you').
'inside' is an insertion indicator.
'for' enclosing 'ye' is 'FOYER'.
(Other definitions for foyer that I've seen before include "Theatre's entrance hall" , "Vestibule" , "Theatrical" , "Entrance hallway" , "Theatre public area" .)