Athlete who leaps over barriers (7)
I believe the answer is:
hurdler
'athlete who leaps over barriers' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hurdler that I've seen before include "Athlete who leaps over barriers" , "Athlete who jumps while running" , "Jumping runner" , "Athlete who runs and jumps" , "Horse that races 'over the sticks'" .)