Where some are playing football, or riding around (8)
I believe the answer is:
gridiron
'where some are playing football' is the definition.
(term for the field in American football)
'or riding around' is the wordplay.
'around' is an anagram indicator.
'or'+'riding'='orriding'
'orriding' with letters rearranged gives 'GRIDIRON'.
(Other definitions for gridiron that I've seen before include "Scene of American football" , "The field of play in American football" , "on which Lawrence was roasted" , "Grill - American football field" , "Support for grilling food" .)