A bad role turning out to be delightful (8)
I believe the answer is:
adorable
'to be delightful' is the definition.
(I've seen this before)
'a bad role turning' is the wordplay.
'turning' indicates an anagram.
'bad'+'role'='badrole'
'badrole' is an anagram of 'dorable'.
'a'+'dorable'='ADORABLE'
'out' acts as a link.
(Other definitions for adorable that I've seen before include "Inspiring love" , "Very pleasing" , "Loveable" , "Quite delightful, fit to be worshipped" , "Attractive - captivating" .)