Beginner without sin? (6)
I believe the answer is:
novice
'beginner' is the definition.
('novice' can be a synonym of 'beginner')
'without sin?' is the wordplay.
'without' becomes 'no'.
'sin?' becomes 'vice'.
'no'+'vice'='NOVICE'
(Other definitions for novice that I've seen before include "Rod, tee up the ship-worm" , "Noob" , "Beginner, learner" , "Beginner, tyro" , "Beginner, perhaps at religious orders" .)