Trouble near a stadium (5)
I believe the answer is:
arena
'stadium' is the definition.
('arena' can be a synonym of 'stadium')
'trouble near a' is the wordplay.
'trouble' indicates an anagram.
'near' anagrammed gives 'aren'.
'aren'+'a'='ARENA'
(Other definitions for arena that I've seen before include "Sphere of action" , "Place for public events" , "Area of activity, boxing perhaps" , "combat zone" , "Area of combat" .)