Disturbing live adder is reckless (9)
I believe the answer is:
daredevil
'reckless' is the definition.
(thesaurus)
'disturbing live adder' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'live'+'adder'='liveadder'
'liveadder' anagrammed gives 'DAREDEVIL'.
'is' acts as a link.
(Other definitions for daredevil that I've seen before include "One who enjoys dangerous activities" , "Lived, dear like rckless adventurer" , "rash" , "No cautious type" , "Reckless person, thrill-seeker" .)