Reckless lawyer terribly reviled (9)
I believe the answer is:
daredevil
'reckless' is the definition.
(thesaurus)
'lawyer terribly reviled' is the wordplay.
'lawyer' becomes 'da' (abbreviation for District Attorney).
'terribly' is an anagram indicator.
'reviled' with letters rearranged gives 'redevil'.
'da'+'redevil'='DAREDEVIL'
(Other definitions for daredevil that I've seen before include "Reckless, impetuous and irresponsible person" , "Lover of danger" , "Stuntman" , "Someone who enjoys being reckless" , "One who enjoys dangerous activities" .)