Sporting venue (7,5)
'sporting venue' is the definition.
(sports arena)
This is all the clue.
(Other definitions for arena that I've seen before include "Place for public contests" , "Sporting venue enclosed by seats" , "place for sporting contest" , "... might perform here" , "Performance space" .)
(Other definitions for playing field that I've seen before include "Sports ground" , "performing nocturne?" , "Pitch" , "level, to be fair" , "Avoiding attachment to one special" .)