The spectators' entrance (4)
I believe the answer is:
gate
I believe this is a double definition.
'the spectators'' is the first definition.
(I've seen this before)
'entrance' is the second definition.
(type of entrance)
(Other definitions for gate that I've seen before include "Number attending" , "Total of spectators" , "Barrier, exit" , "Access here" , "Portal" .)