Related Clues:

• 'I might know!'
• 'I might, if you're willing to ask'
• Sign by a sample
• 'You might be surprised'
• 'You have my full attention' ... or something 17-, 24-, 38- and 51-Across might say?
• "You have my full attention!"
• 'Go ahead . . .'
• "You've got my undivided attention"
• Response to "You won't believe this"
• "You have my attention"
• "Bring it!"
• "Ask, if you dare"
• ***"You've got my attention" (letters 1-3)