Sportsperson, part of eleven, terminated (7)
I believe the answer is:
eventer
'sportsperson' is the definition.
'part of eleven terminated' is the wordplay.
'part of' says the answer is hidden in the clue.
'EVENTER' is hidden within 'eleven terminated'.
(Other definitions for eventer that I've seen before include "Rider in contests" , "versatile horse" , "Competitive horse/rider" , "competitive horse" , "Competing horse or rider" .)