Faultless from rookie (6)
I believe the answer is:
novice
This clue might be a double definition.
'faultless' is the first definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'rookie' is the second definition.
(I've seen this before)
'from' is the link.
Can you help me to learn more?
(Other definitions for novice that I've seen before include "A beginner or student nun" , "Convert" , "Beginner, trio" , "Rookie" , "Trainee monk" .)