Impediment right for someone on track (7)
I believe the answer is:
hurdler
'someone on track' is the definition.
'hurdler' can be an answer for 'someone' (hurdler is a kind of someone). I'm not sure about the 'on track' bit.
'impediment right' is the wordplay.
'impediment' becomes 'hurdle' (hurdle is a kind of impediment).
'right' becomes 'r' (common abbreviation).
'hurdle'+'r'='HURDLER'
'for' is the link.
Can you help me to learn more?
(Other definitions for hurdler that I've seen before include "Horse that races 'over the sticks'" , "Athlete who runs and jumps" , "Athlete who leaps over barriers" , "Runner and jumper" , "Athlete who jumps while running" .)