Pro wins, he is out for a title (9)
I believe the answer is:
ownership
'a title' is the definition.
(legal term for ownership)
'pro wins he is out' is the wordplay.
'is out' is an anagram indicator (out can mean wrong or inaccurate).
'pro'+'wins'+'he'='prowinshe'
'prowinshe' anagrammed gives 'OWNERSHIP'.
'for' is the link.
(Other definitions for ownership that I've seen before include "Legal title" , "Proprietorship, possession" , "The right of possessing something" , "Proprietary right of possession" .)