I met adult, badly disfigured (9)
I believe the answer is:
'disfigured' is the definition.
(mutilating is a kind of disfiguring)
'i met adult badly' is the wordplay.
'badly' indicates anagramming the letters.
'imetadult' is an anagram of 'MUTILATED'.
(Another definition for mutilated that I've seen is " Mangled".)