Possible Clues:

• *Brevity is the soul of ___
• 'Slow down . . .'
• Hang on - is this a job for those in 14 across?
• “Hold on a sec!”
• Serve ace: something funny about that?
• Delay; hold back
• 'Actually, hang on . . .'
• 'Hold on . . .'
• Hang around with barista, regularly
• "Not so fast!"