Related Clues:

• Loss (in concentration, say?)
• Small piece of paper
• Fall from the faith
• Sepal (anag)
• Expire, as an insurance policy
• Fall in the rankings
• Careless misstep
• Mistake to swallow litre
• Senior moment, e.g
• Lose footing
• Subscription slip
• Mental failure
• Slip of memory
• Tiny misstep
• Break in concentration