Untrustworthy daughter, she is not reforming (9)
I believe the answer is:
dishonest
'untrustworthy' is the definition.
('dishonest' is associated in meaning with 'untrustworthy')
'daughter she is not reforming' is the wordplay.
'daughter' becomes 'd'.
'reforming' is an anagram indicator.
'she'+'is'+'not'='sheisnot'
'sheisnot' is an anagram of 'ishonest'.
'd'+'ishonest'='DISHONEST'
(Other definitions for dishonest that I've seen before include "cheating" , "Untruthful - mendacious" , "Not straightforward" , "Crooked" , "shifty" .)