No good in a new role that's extended (6)
I believe the answer is:
longer
'that's extended' is the definition.
I can't judge whether this defines the answer.
'no good in a new role' is the wordplay.
'no good' becomes 'ng' (abbreviation).
'in' is an insertion indicator.
'a new' indicates an anagram.
'role' is an anagram of 'loer'.
'ng' going within 'loer' is 'LONGER'.
Can you help me to learn more?
(Other definitions for longer that I've seen before include "More extended" , "Less short" , "Of greater duration" , "Of greater length" , "Measuring greater distance end to end" .)