Athlete Ben led off run (7)
I believe the answer is:
hurdler
'athlete' is the definition.
(hurdler is a kind of athlete)
'ben led off run' is the wordplay.
'ben' becomes 'hur' (ben hur is a religious drama film).
'off' indicates an anagram.
'run' becomes 'r' (cricket abbreviation).
'led' is an anagram of 'dle'.
'hur'+'dle'+'r'='HURDLER'
(Other definitions for hurdler that I've seen before include "Horse that races 'over the sticks'" , "Track athlete" , "Athlete who runs and jumps" , "Athlete who jumps while running" , "Athlete who leaps over barriers" .)