Sports sites (6)
'sports sites' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stadia that I've seen before include "large arenas" , "Big venues" , "major venues" , "Sports grounds" , "Sports arenas" .)
'sports sites' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arenas that I've seen before include "Central spaces of stadiums or amphitheatres" , "Spheres, areas of activity" , "Central areas of, say, sports stadiums" , "Spaces in centre of stadiums" , "Structures for open-air events" .)
(Other definitions for gyms that I've seen before include "sporting facilities?" , "In brief, places of exercise" , "'Physical training facilities, in short (4)'" .)