One way of getting out as match proceeds (4)
I believe the answer is:
gate
I believe this clue is a double definition.
'one way of getting out' is the first definition.
(exit gate)
'match proceeds' is the second definition.
(proceeds from people attending a sporting event)
'as' acts as a link.
(Other definitions for gate that I've seen before include "Airport boarding point" , "Total of spectators" , "Frame for closing an entrance" , "Movable barrier in a fence or wall" , "Attendance figure" .)