In his sport, he has to study a bit of form (8)
I believe the answer is:
toreador
'in his sport he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'to study a bit of form' is the wordplay.
'study' becomes 'read' (synonyms).
'a bit of form' becomes 'or' (I can't explain this - if you can you should give a lot more credence to this answer).
'to'+'read'+'or'='TOREADOR'
'has' is the link.
Can you help me to learn more?
(Other definitions for toreador that I've seen before include "One who fights bulls" , "Killer facing charges" , "one features in The Ring" , "killer on mount" , "Too drear for a bullfighter" .)