One who fought a dog trial unrestrainedly (9)
I believe the answer is:
gladiator
'one who fought' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'a dog trial unrestrainedly' is the wordplay.
'a dog trial' can be anagrammed to 'GLADIATOR'.
However, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for gladiator that I've seen before include "Film" , "Colosseum combatant" , "Professional combatant in ancient Rome" , "Man appearing in ring" , "One scrapped" .)