Scattered his cattle on the track, perhaps (9)
I believe the answer is:
athletics
'the track perhaps' is the definition.
(track is a kind of athletics)
'scattered his cattle on' is the wordplay.
'scattered' indicates an anagram.
'on' is a charade indicator (letters next to each other).
'his' put after 'cattle' is 'cattlehis'.
'cattlehis' is an anagram of 'ATHLETICS'.
(Other definitions for athletics that I've seen before include "Physical sports for trained competitors" , "Lithe acts observed in sporting contests" , "Track and field sports" , "Track and field sport" , "Olympic events" .)