Related Clues:

• Barely detectable amount
• Greek letter and small amount
• A just detectable amount
• Just a jot, or a Greek letter
• The smallest possible amount, or the Greek i
• The Greek i (4)
• Small letter, ninth in the Greek alphabet
• Just a jot, like Greek letter
• Very small amount for a Greek letter
• The smallest amount
• 'Very small amount, jot (4)'
• Thank you for the ten - even though it's so little
• A tiny ten, thank you
• Very little thanks with ten
• Is there a trace of this up for ABCDEFGHI?