Possible Clues:

• Comment accompanying a dismissive hand wave
• Possible follow-up to 'Which one?'
• Words following 'Which thing?'
• Words often followed by “It’s no big deal”
• 'Ah, you mean this?'
• "Ah, I see what you meant"
• 'Ah, I see what you meant'
• Words sometimes followed by 'It's nothing'
• Bit of false modesty
• 'Ah, I didn't know what you were referring to'