Possible Clues:

• New member (of religious order)
• Nothing wrong with being one in 3 down
• Possibly a learner driver's late autumn road hazard
• There isn't any harm in one so new
• Potential nun
• What one might aspire to as religious probationer?
• Student finding feature of winter in autumn?
• Lack of grip shown by apprentice
• Acolyte retrospectively concerned with sin
• Beginner, learner