Rock concert venue (5)
I believe the answer is:
arena
'rock concert venue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arena that I've seen before include "Cheap Prom tickets" , "Place of activity, especially conflict" , "domain" , "Action space in centre of amphitheatre" , "Gladiatorial ring" .)